Akademik

М-283
ДРУГАЯ (ИНАЯ, HE ТА) МУЗЫКА highly coll , often humor NP often subj-compl with бытье ( subj: это) usu. this WO (that is) something else entirely, entirely different
another matter (altogether)
a different (an entirely different) story (thing) a horse of a different color.

Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. . 2004.