I can't put out a blanket statement for music overall. I can do it by genre (broad use of genres here. For example, I'm including bluegrass and alt-folk into Folk), though:
Punk: 1980's (Minor Threat, Mission of Burma, The Clash, Fugazi, Sonic Youth, Minutemen, The Replacements, etc)
Folk: 2000's (Wilco, Bon Iver, Laura Marling, Iron & Wine, Chris Thile/The Punch Brothers, Fleet Foxes, etc)
R&B: 1970's (Bill Withers, Barry White, Al Green, Aretha Franklin, Gladys Knight and the Pips. And though I can't name a single other song of his I like, Stevie Wonder's "Superstition" is fantastic)
Rock: 1990s (Pixies, Pavement, Smashing Pumpkins, Built To Spill, The Cranberries, Beck, Nirvana, etc)
Electronic: 2000's (LCD Soundsystem, Daft Punk, M83, Boards of Canada, Explosions in the Sky)
Rap/Hip Hop: 2000's. Yes, I thought the last decade was amazing as far as music goes. (Kanye West, Jay-Z, Wale, The Roots, M.I.A., etc)
My favorite music tends to come from punk and Folk. Wilco is my favorite band. After that, I don't order them. Among my favorites are Pixies, Sonic Youth, The Punch Brothers, Bill Withers, Minutemen, LCD Soundsystem, and Built to Spill. And I'm 23.