The Unofficial XM File Format Specification
XM is one of the major module formats. Module files, also known as tracker modules or tracker music, are a family of music files originated in the times of the Amiga computer in the late 80s. They became an important part of the demoscene subculture. The modules are still popular among the professional musicians, demosceners and enthusiasts
eBook, English, 2007
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CelerSMS, 2007