Reply To: Changing the music
And here’s the list of files & songs associated with them 
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city_music_01.ogg – Music from Works Quarter
city_music_02.ogg – Music from Little Italy
city_music_03.ogg – Music from Chinatown
city_music_04.ogg – Music from Downtown
city_music_05.ogg – Music from Oakwood
city_music_06.ogg – Music from New Ark
city_music_07.ogg – Music from Hoboken
city_music_08.ogg – Music from Oakhill
city_music_09.ogg – Music from Central Island
city_music_10.ogg
city_music_11.ogg
city_music_12.ogg
city_music_13.ogg
city_music_15.ogg
Last five files are associated with music from countryside (unfortunately, I cannot tell you where exactly are they played).
Like JOJOXX said, they can be found in SOUNDS/MUSIC folder.