There are DOS-based MOD and MP3 players that output to the PC speaker.

Qmmp is still being developed: https://qmmp.ylsoftware.com/

Before that it was called x11amp, and after that it's been succeeded by a fork that ended up being Audacious, apparently.

Remember that before Winamp, there was DOSamp! I used to use version 0.8. Playback was jerky on a 486DX2/66 but once I upgraded to a Pentium, it was smooth sailing.

Actually yeah I had forgotten about that alpha version awkwardly called “Winamp:Mac” because “MacAMP” was already taken by not-Nullsoft https://macintoshgarden.org/apps/winampmac https://macintoshgarden.org/apps/macamp-10-preview-edition

And the Android version which I used briefly around 2010 before getting into Subsonic/D-Sub https://forums.winamp.com/forum/winamp/winamp-for-android/29...