1) Yannick Kilian Chavanne, aka Yak, was the leader of the band Glowing Shade from Geneva (Switzerland). He recorded on his own an album titled 'In a Dim Ringing', in 2002, which sounds quite like experimental and minimalist alternative rock. He never performed it on stage.
2) YAK is an experimental hardcore band from Italy
3) The progressive rock band YAK from the UK were formed in 1982.