Okay, this is a brilliant site. Chiptunes on demand, lightweight DOS-like interface. Two thumbs up!
https://chiptune.app/browse
Chip Player JS
An online MIDI and VGM music player with SoundFont support. Over 250,000 songs, focused on performance and nostalgia. Play VGM, SPC, NSF, S3M, XM, MOD and more.
Blerkotron