I heard it while sitting in a Taiwanese cafe, but I don't know who the singer is or what the song is called.
I WANT THE MAD HATTER! Help Me? (屮ﾟДﾟ)屮
that's was in really quiet volume but luckily I picked out the song
it's one of my favorite by F.I.R
The song is called 月牙灣 or Crescent Moon Bay and it's by F.I.R (a three member band consisting of one girl lead singer, Faye, keyboard player, Ian, and guitarist, Real)
it's off of their fourth studio album, 愛‧歌姬 or Love‧Diva in 2007