TheoryMusic is a digital music streaming and podcast services developed by Theorysonic. It was launched on May 1, 1999 in El Kadsre, then launched internationally starting with United States and United Kingdom. It competes with Tuzago, iTunes, Amazon Music, and Spotify.


Originally as a music service for TS-UGOS computers, TheoryPhone, TheoryPDA, TheoryPDA Style, and Portosic Digital devices to curb its MP3 music piracy.


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