Well, Mak loves this song, so I thought I should ask Akmal to prepare the song while she was at my house the past two weeks. Here is the result.
Akmal did everything from piano arrangement - due to non availability of the piano sheet, to video shooting and editing. Obviously he performed the song himself too. I truly believe that this is the best piano solo version of Ketulusan Hati on Youtube.
Enjoy. While this song is not a religious song, the lyric can be interpreted as such.