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"Altmusic" or "Alt Music" is an abbreviation for the phrase "alternative music".

The abbreviation is commonly used when people are too lazy to actually spell out the whole phrase "alternative music" or hit a character limit. This abbreviation cost 9 less characters.

Altmusic may be shortened to 4 characters by typing "alt" followed by a music emoji but this isn't common since a vast majority of people that listen to alternative music are hipsters and think emojis are "too mainstream"
Courtney: Luke's instagram bio sais "altmusic" , what the hell does that mean?
Jessica: It means he listens to alternative music, duh.
via giphy
by insta_lvke98 April 22, 2016
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