[_chu1]

WebTV actually had a really neat sound system. They were one of the first clients of Headspace Inc (later Beatnik) which was started by Thomas Dolby because he felt there was a lack of tools to create interactive computer audio. Before WebTV they worked on the soundtrack

Headspace created the RMF file format, conceptually a mix between an SMF and a tracker song (XM, S3M) featuring compressed or low bitrate integrated patches, which was later used as the ringtone format for almost every flip/feature phone in the 2000s (notable examples include the T-Mobile Sidekick/Danger Hiptop and most by Nokia).