If you're a fan of jazz music, then you can't go wrong with the soundtracks to pretty much every SimCity game since 2000. Their composer, Jerry Martin, is a genius. The songs are especially awesome due to the fact that they aren't just jazzy sounding melodies, but full, complete jazz songs, right down to the amazing improvs, which aren't generally used so completely in regular gameplay elsewhere (generally being only used for credits or special sequences and such), and they have a great band besides, especially in SimCity 3000:
Streets of Sim City received the same Jerry Martin treatment in the music department. Despite the game being unfortunately riddled with Obvious Beta bugs that probably will never be fixed (since it was released back in 1997), the soundtrack actually manages to be even more memorable and awesome than the SimCopter score, and many of the songs were recycled into The Sims and even The Sims 3. Some notable examples:
The SNES version of SimCity has a different BGM for all six city sizes, every one a winner: Village,Town,City,Capital,Metropolis, and Megalopolis. The gradual increase in energy from the laid back Village track to the triumphant Megalopolis track suits the growth of the city perfectly.
While we're on the subject of the SNES version: "Village" and "Town" were orchestrated for the second Orchestral Game Music Concert back in 1992. This is every bit as awesome as it sounds.
The 2013 reboot expands the soundtrack as your city increases in population and they saved the better tracks for later. The first time you hear Town and Out feels monumental. Make a megalopolis and you'll get the wonderfully sophisticated Tale of Sim Cities.