I guess I'm still stuck in the past. My faves:
Creedence Clearwater Revival ( best damn rock'n'roll band there ever was)
Stan Rogers
Beach Boys
John Fogerty (best rock'n'roll voice there ever was)
The Beatles
The Doors (ah, Jim Morrrison's velvety baritone...)
Abba (almost embarrassed to admit that one)
Eric Clapton
Randy Bachman (The Guess Who and BTO, a superlative musician)
John Prine
Leo Kottke
Chet Atkins and Jerry Reed
Flatt and Scruggs
Patsy Cline
Jethro Tull
Tommy Makem and Liam Clancy
Paul Simon
Doc Watson
Don McLean
Dire Straits
Magna Carta (brilliant British folk group)
Phil Collins
The Dillards
Crosby, Stills, Nash, and Young
For classical stuff, anything by the Berlin Philharmonic or London's Academy of St. Martin in the Fields, doing Vivaldi, Handel, Beethoven, Bach, Mozart...anybody, will well repay your attention.
For opera, the best single piece in the repertoire in my not very humble opinion is the Depths of the Temple duet from The Pearl Fishers. The rest of that opera sucks out loud, but that piece justifies its existence. The best version is by Jussi Björling and Robert Merrill, and Placido Domingo and Luciano Pavarotti did a pretty good rendition as well. That one always makes the little hairs on the back of my neck stand up. The blending of two very powerful male voices is... well, beyond words. Ya gotta hear it, and if it fails to stir your deepest feelings, you must be dead from the neck up.