Easy Piano - Level 2 - Digital Download SKU: A0.894618 By Whitney Houston. By Jeffrey Osborne and Michael Masser. Arranged by Peter Edvinsson. Contemporary,Pop. Score. 2 pages. Peter Edvinsson #3908955. Published by Peter Edvinsson (A0.894618). This is an easy piano version of the song All At Once sung by Whitney Houston. I have transposed the song from Bb-major to C-major, omitted the key changes and simplified the melodic rhythm but have tried to preserve the harmonies. The song is shortened and the intro is omitted. Instead of the fade out coda I have made a traditional ending. Here is some information about the song from Wikipedia: