John Patrick Thomas Pentland is an Irish-born rock guitarist and a member of the Canadian rock band Sloan. All four members of Sloan write, produce, and sing their own songs, but Pentland primarily plays lead guitar for most songs. He occasionally plays rhythm guitar, bass, keyboards in the studio, and occasionally plays drums live. Pentland is one of the band's two main singers, as he sings lead on at least a third of the band's songs, including many of their singles on their third to fifth albums, plus back-up/harmony vocals on most of their other songs.

Sloan is a Canadian rock band based in Toronto and originally from Halifax, Nova Scotia. Sloan have released thirteen full-length albums and have received nine Juno Award nominations, winning one. Between 1996 and 2016, Sloan was among the top 75 best-selling Canadian artists in Canada and among the top 25 best-selling Canadian bands in Canada. The band is known for their sharing of songwriting and lead vocals from each member of the group and their unaltered line-up throughout their career.