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Old Time and Irish songs are about whiskey, food and struggle. Bluegrass
 songs are about God, mother and the girl who did me wrong. If the girl isn’t dead by the third verse, it ain’t Bluegrass. If everyone dies, it’s Irish. Old Time and Irish bands have nonsense names like "Flogging Molly," "Fruit
 Jar Drinkers," and "Skillet Lickers" while Bluegrass bands have serious
 gender-specific names like "Bluegrass Boys," "Clinch Mountain Boys" and 
"Backwoods Babes." The most common Old Time keys are major and minor with only 5 notes (modal).
 Bluegrass uses these, plus Mixolydian and Dorian modes, and a Irish band
adds Lydian and Phrygian modes. A Bluegrass band has between 1 and 3 singers who are all singing about an octave above their natural vocal range. Some Old Time and Irish bands have
 no singers at all. If a Irish band has a singer, it is usually either a bewhiskered ex-sailor, or a petite soprano. A Bluegrass band has a vocal
arranger who arranges three-part harmonies. In an Old Time band, anyone who feels like it can sing or make comments during the performance. In a Irish band, anyone who speaks during a performance gets "the look," and songs are preceded by a call for silence and a detailed explanation of their cultural
significance. Bluegrass tunes & songs last 3 minutes. Old Time and Irish
tunes & songs can be any length, and sometimes last all night. The Instruments Banjo A Irish banjo is short, with 4 strings,small and quiet. An Old Time banjo is open-backed, with an
old towel (probably never washed) stuffed in the back to dampen sound. A
Bluegrass banjo has a bell bronze Mastertone tone ring and a resonator to make it louder.
A Irish banjo weighs 4 pounds, an Old Time banjo weighs 5 pounds, towel
included and a Bluegrass banjo weighs 40 pounds. A Irish banjo has only 4 strings. A Bluegrass banjo has five strings and needs 24 frets. An Old Time
banjo needs no more than 5 frets, and some don’t need any. A Bluegrass banjo player has had spinal fusion surgery on all his vertebrae,
and therefore stands very straight. If an Old Time banjo player stands, he
 slouches. A Irish banjo player has a brace to relieve his carpal tunnel
syndrome and remains seated to maintain stability while picking as fast
as possible after several pints. An Old Time banjo player can lose 3
right-hand fingers and 2 left-hand fingers in an industrial accident without affecting his performance.
An Irish banjo player flat picks everything. A Bluegrass banjo player puts jewelry on his fingertips to play. An Old Time banjo player puts super glue
on his fingernails to strengthen them. Never shake hands with an Old Time banjo player while he’s fussing with his nails. Fiddle The Bluegrass fiddler paid $10,000 for his fiddle at the Violin Shop in
Nashville. The Irish fiddler inherited his fiddle from his mothers 2nd
cousin in County Clare. The Old Time fiddlers got theirs for $15 at a yard
Irish and Bluegrass fiddles are tuned GDAE. An Old Time fiddle can be in a
hundred different tunings. Old Time fiddlers seldom use more than two fingers of their left hand, and use tunings that maximize the number of open strings played. Irish and Bluegrass fiddlers study 7th position fingering patterns
with Isaac Stern, and take pride in never playing an open string. An Old Time fiddle player can make dogs howl & incapacitate people suffering from sciatic nerve damage. An Old Time fiddle player only uses 1/8 of his bow. The rest is just there for show. Guitar An Old Time guitarist knows the major chords in G and C, and owns a capo for
A and D. A Bluegrass guitarist can play in E-flat without a capo. The 
fanciest chord an Old Time guitarist needs is an A to insert between the G
and the D7 chord. A Bluegrass or Irish guitarist needs to know C#aug + 7-4. An Irish guitarist keeps his picks in his pocket. Old Time guitarists stash extra picks under a rubber band around the top of the peg head. Bluegrass guitarists would never cover any part of the peg head that might obscure the gilded label of their $10,000 guitar. Mandolin It’s possible to have an Old Time or Irish band without a mandolin. However,
 it is impossible to have a true Bluegrass band without one. Mandolin players
 spend half their time tuning their mandolin and the other half of their time playing their mandolin out of tune. Old Time and Irish mandolin players use
 "A" model instruments (pear-shaped) by obscure makers. Bluegrass mandolin players use “F" model Gibsons that cost $100 per decibel. Bass An Irish band never has a bass, while a Bluegrass band always has a bass. An old, Old Time band doesn’t have a bass, but new Old Time bands seem to
 need one for reasons that are unclear. A Bluegrass bass starts playing with the band on the first note. An Old Time bass, if present, starts sometime
after the rest of the band has run through the tune once depending on the player’s blood alcohol content. A Bluegrass bass is polished and shiny. An Old Time bass is often used as yard furniture. Other Instruments It is not possible to have a Irish band without a tin whistle or Bodhran
(hand drum) if not several, usually too many of each. Old Time and Bluegrass
bands never have either. A Bluegrass band might have a Dobro. An Old Time band might have anything that makes noise including: a tambourine, jaw harp,
 didgeridoo, harmonica, concertina, wash tub bass, miscellaneous rattles & shakers,
a 1-gallon jug (empty), or a lap (mountain) dulcimer or a hammered dulcimer.
 In a Irish band, it’s the musicians that are hammered. Instrumentation Except for the guitar or bouzouki, all the instruments in an Irish band play the melody all the time. In an Old Time band, anyone can play either melody or
 accompaniment at any time. In Bluegrass bands, one instrument at a time solos, and everyone else plays accompaniment. Bluegrass bands have carefully mapped-out choreography due to the need for solo breaks. If Old Time and Irish band members move around, they tend to run into each other. Because of this problem (and whiskey) Old Time and Irish musicians often sit down when performing, while a Bluegrass band always stands. Because they’re sitting, Old Time and Irish bands have the stamina to play the same tune for 20 minutes for a square or contra dance. The audience claps
after each Bluegrass solo break. If anyone talks or claps near an Old Time or Irish band, it confuses them, even after the tune is over. Personalities and Stage Presence Bluegrass band members wear uniforms, such as blue polyester suits with gray
Stetson cowboy hats. Old Time bands wear jeans, sandals, work shirts and caps from seed companies. Irish bands wear tour tee-shirts with plaid touring caps.
All this head wear covers bald spots. Women in Bluegrass bands have big hair and Kevlar undergarments. Women in Old
Time bands jiggle nicely under their overalls. There are no Women in Irish
bands, only Lassies with long skirts and lacy, high collars and wenches in apple- dumplings-on-a-shelf bodices and leather mini-skirts. A Bluegrass band tells terrible jokes while tuning. An Old Time band tells terrible jokes without bothering to tune. Bluegrass band members never smile. Old Time band members will smile if you give them a drink. A Irish band is too busy drinking to smile, tune or tell jokes. Irish musicians eat fish and chips, Bluegrass musicians eat barbecue ribs, and Old Time musicians eat tofu and miso soup. Bluegrass musicians have mild high frequency hearing loss from standing near the banjo player. Old Time musicians have moderate high frequency hearing loss from sitting near the fiddler. Irish musicians have advanced hearing loss from playing in small pubs with all those fiddles, banjos, tin whistles and bodhrans. Festivals and Transportation A Irish band travels in an actual public bus with marginal air conditioning and then catches a ride from the bus stop to the festival any way they can. A Bluegrass band travels in an old converted Greyhound bus that idles in the parking lot all weekend with the air conditioner running full blast, fumigating the county with diesel exhaust. An Old Time band travels in a rusted-out 1965 VW microbus that blows an engine in North Nowhere, Nebraska. They don’t have an Easy-Up, and it’s pretty evident that their vehicles don’t have air conditioning. Bluegrass players stay on the bus and
Irish musicians stay at the nearest B&Bs while Old Time musicians camp in the parking lot. The Irish Band has their name on their instrument cases and a banner for their Easy- Up. The bluegrass band’s name and Inspirational Statement are painted on both the side and front of the bus in script lettering. Bluegrass bumper stickers are in red, white and blue and have stars and/or stripes on them. Irish bumper stickers display fancy knotwork borders, banners, and slogans from the old country. Old Time bumper stickers don’t make any sense (e.g. “Gid is My Co-Pilot’ )
The Difference Between Old Time, Blue Grass and Irish Music Courtesy The Hudson Valley, New York Bluegrass Association