I'd look for those Rhino compilations and set the player on shuffle.
We boomers, as the post-war baby bulge, actually got going with music as early as the late 50's early 60's.
For this 52 YO boomer (and BTW, I started really grooving to the music via radio at about age 12), the classic MUST HAVES would include:
Beatles
Beach Boys
Rolling Stones
Four Seasons
Who
Motown
Stax Volt (Sam & Dave et al)
Aretha Franklin
Sam Cook
Buffalo Springfield
Byrds
Cream
Jefferson Airplane
Procul Harem
Creedence
Van Morrison
Kinks
Sam the Sham & The Parohs
The Turtles
Mitch Ryder & The Detroit Wheels
and some reggae - Jimmy Cliff, Bob Marley etc.
You must include early Steely Dan.
You should also throw in some...
Joni Mitchell
Stevie Wonder
Led Zep
Crosby Still & Nash
Pointer Sisters
...and how about some proggers...
Yes
ELP
Jethro Tull
Kansas
Genesis
...although I generally prefer glam & funk for parties...
David Bowie
Peter Gabriel
Roxy Music
Mott The Hoople
T Rex
Lou Reed
Elton John (no Benny & The Jets!! NO!!!)
Parliament/Funkadelic
LaBell
I'm not keen on metal but ya gotta rock 'n roll...
Deep Purple
Blue Oyster Cult
Bad Company
...or you could really mess with their minds with bitchin' new wave stuff...
New York Dolls
Blondie
Elvis Costello
Talking Heads
The Clash
Ramones
(Better avoid the Sex Pistols.)
I suppose you should also throw in some disco...
Donna Summer
Village People (Can you have a party without 'em?)
Bee Gees
Above all, avoid crashing boors and non-entities like Bread and America (I gag whenever I hear Horse with no name - gagging at parties is not good.)
Definitely get the compilations.
God! I'm so old I remember when radio was great!