Minus-One recordings

In the Philippines, the Minus-One (commonly, albeit improperly, spelled "minus one"[1] without the hyphen) is a variant mix of a multi-track recording, wherein the lead vocal track of a song is muted for further use.

Succinctly, a B-side selection became referred to as "minus-one" because the lead vocal track is subtracted from the A-Side song's original mix.

The concept of instrumental B-sides to complement their full versions became a production trend of the Philippine record industry of the 1980s, which was replicated overseas.

[8] In the ensuing years, tracks from minus-one flip sides were assembled by production houses for their inclusion in compilations.

In 1975, Filipino executive Roberto del Rosario patented his sing-along invention as Minus-One, popularly known as the karaoke machine, an interactive entertainment system without vocals[4].