Judging from the many previous threads about music, heavy metal is by far the most popular music genre among SYM members. Personally, it is one of the few genres I don't like, so I will recommend some completely different musical styles.
Popular music
Joko,from village to Town - Youssou N'Dour, the most well known African popular music singer and also in my opinion, the best male voice in all of popular music.
Medulla - Björk's totally vocal album including human rythm boxes and Greenlandic choirs
Find a collection with Malcolm Mclaren's 12' inches of early scratching like Madame Butterfly, Carmen, Buffalo Gals, Hey DJ, Paris is jazz. If you can't find a collection, look for the remix album "Buffalo Gals back to skool" or "Fans"
Classical music
Shostakovitch 10th symphony - the greatest piece of music ever composed, in my opinion. Best is to get a version recorded by the old USSR minstry of Culture Symphony Orchestra directed by Gennady Rozdyezvensky, failing that try to get the Russian Symphony orchestra version from the 1990's. Failing also that, get one with Bernard Haitink and London Philharmonics. If you are to buy only 1 more CD in your entire life, go for this one.
Rachmaninov - Rhapsody on a theme of Paganini
Ligeti - Lux Aeterna, Atmospheres, Continuum...or if you look for an album, try Mechanical Music.
If you like beautiful piano music, try for instance Chopin's nocturnes or Liszt 1st piano concerto.
If you like choir music, try Palestrina or Vivaldi's Gloria in D.
Jazz
The Rh Factor - Roy Hargrove, one of the best contemporary jazz musicians who is influenced by hiphop
Amandla or Tutu - late crispy works by Miles Davis. Or buy some album together with John Coltrane if you like more traditional jazz
The Köln Concert or Staircase - Keith Jarret, excellent modern jazz pianis
Experimental/Electronic
I can't talk about music without mentioning my darlings The Residents. Their best album in my opinion is "Not available", failing that, try "Eskimoo" or "Commercial album" (the latter is easier to learn to listen to)
Stockhausen - Kontake. The mother of contemporary experimental music. You can also try Stimmung.
Various
The girl from Ipanema - or any title that covers the classical bossanova by Jobim & Gilberto.
Some "best of" tango nuevo composer Astor Piazzolla that includes his most famous works like Adios Nonino, Ausencias, Libertango, Balada para un loco, Meditango, Michelangelo, Tango Fugata.
That's all I can think of right now, this is stuff that no human being in the industrial world should live without having heard at least once!
