The flame-haired wonder's take on 'Take Me To Church' has clocked up a whopping 4.32 million YouTube views, but there's plenty of other cracking renditions in his arsenal.
Here's his version of Hozier's hit, plus 10 other well-known tunes he's wrapped his vocal-cords round.
If you've any other favourites, let us know!

5 Seconds Of Summer's 'She Looks So Perfect'

Beyoncé's 'Drunk In Love'

Britney Spears' 'Baby Hit Me One More Time'

Lorde's 'Royals'

Taylor Swift's 'I Knew You Were Trouble'

Snow Patrol's 'Chasing Cars'

Blackstreet's 'No Diggity'

Oasis' 'Wonderwall'

Sam Smyth's 'Stay With Me'

The Beatles' 'In My Life'