This song is under the ‘Evergreen’ category but I don’t know who the original singer is. The version I have listened to is by Westlife. The keys that I used in the video follow that of Westlife’s. There are 2 keys in the song: F# and A.
Part 1 and Part 2 are in F#. Part 3 is actually just a repeat of Part 2 but raised to the key of A.
Piano Cheats 