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Junko Yagami - Tank Music

"Cheater" from the album "Communication" replaces tank music. Sung by Junko Yagami.

Type in snd_rebuildaudiocache in the developer console to enable proper looping of this custom tank music! Enable developer console through options in game menu. Use the tilde key (~) to access the developer console.
You can also subscribe to this addon for example, for easy access to rebuilding the audio cache through the game menu: https://test-steamproxy.haloskins.io/sharedfiles/filedetails/?id=1305377347.

Some people apparently had some luck using longer files than the original files (tank.wav and taank.wav). I tried myself by using snd_rebuildaudiocache, but this didn't work. Probably the used music file is too long, so there is a certain maximum of seconds that a file can be in addition to the original length.