Achtung Baby and The Joshua Tree by U2.
I think, quite often, one of the things a careful upgrade if a component or system can bring is an enhanced appreciation of music we've perhaps not quite latched on to before or lost interest in. I'm listening to Achtung Baby now. Its been a long time since I've really enjoyed this album, but that is what I'm doing now!! The NAD/MS combo just seems to bring all the life back to these tracks. Fantastic.
I'd also have to add Tales of Mystery & Imagination (Alan Parsons Project), Front Parlour Ballads (Richard Thompson), Hokey Pokey (Richard & Lind Thompson), Mock Tudor (Richard Thompson), Absolution (Muse), anything by Nat King Cole or Louis Armstrong, Queen II (Queen), Byrds Sing Dylan (Byrds), all 5 American Recordings albums (Johnny Cash), Hotel (Moby), Seasons (Magna Carta), Harvest (Neil Young), American Stars 'N Bars (Neil Young), Deja Vu (Crosby Stills Nash & Young), The Gershwin Songbook (Oscar Peterson)............
I've seen Richard Thompson, Roger McGuinn, Ralph McTell, Steeleye Span, Fairport Convention, Jethro Tull, BJH, Sting, Elton John, Fleetwood Mac and many others live and I love it when really good hi-fi gets me as close as possible to that live experience (although that could only ever be about 50-60% because live music is just so electric).
On the classical side favourite composers include Chopin, Beethoven, Milhaud, Shostakovich, Schubert, Schumann, Schoenberg, Berg, Ades, Brahms, Haydn, Bartok, Britten and Prokofiev. I also love opera, particularly Verdi, Puccini, Wagner, Purcell (more musical drama than true opera) and Britten.
In terms of performers I could listen all day to Artur Rubinstein, Dinu Lipatti, Carlo Bergonzi, Renee Fleming, Joan Sutherland, Horowitz, Glenn Gould, and Clifford Curzon (amongst many others), but my biggest all time hero as a pianist myself, is the wonderful Alfred Brendel. I had the privilege of seeing him play at Bridgewater Hall a few years ago and it remains one of the highlights of my life.