4 must have hours of baby boomer music?

That's meat and potatoes..nice list. Heck, play some Buffalo Springfield, Moby Grape, Flying Buritto Bros, The Band, Lou Reed; Sky Saxon (the Seeds), and Blue Cheer.. a lot of great mo-town to choose from too.. Warren, if it gets late and people won't leave, have an Oko Yono CD in reserve..

Little Feat
Lynard Skinard
Joe Cocker
Led Zeplin
Fleetwood Mac
Van Morrison
Meat Loaf

There is a 4 disc Motown box set that covers their beginning up to around 1971.Alot of great stuff on it.

If there age groups between 40 & 50 threr music would be late 60s to mid 70s. You start to listen to music at approx
15 yrs. Play a nice mix or rock & roll ulless you friends are duisco ducks where he village people would be more preferable. ( don't laugh, one of my exs was bonkers over them ) Nothing to heavy and the good stuff, Dire Straits, CSNY, Beatles, Jethro Tull and if you think of me a little T-Bone Walker.

If you want everyone up and dancing:
1] 1st santana album
2] supersessions [ bloomfield,kooper,stills ]
3] ccr