I'm with drags it's impossible.....
Im thinking I'd definately need a Zeppelin album in there, then there is early Genesis and Yes, then I'd like an ELP album and I've forgot about Bowie. Rush are one of my favourites, as are the Kinks, King Crimson and the Stones. I know Queen and Elton John aren't everyone's favourites but they made some amazing music.
And I've still failed to get a Jam, Stranglers or Madness album in and they are a must. I love early Sting solo albums and his work with Police, then the bands I shouldn't like but do......like Duran Duran and Spandau and possibly the best pop rock band in ELO.
And still I haven't even mentioned the ladies.........Joan Armatrading, Patti Smith, Annie Lennox, Chrissie Hyde etc etc or Americans like Simon and Garfunkel, or their rock bands .........Jeez Harv it really is impossible.
Just as I've re read this post, I've remembered The Who, U2, Thin Lizzy, Gabriel, Dire Straits ...............I bloody give up.