Lux Aeterna by Clint Mansell (Requiem for a Dream) feels surprisingly natural on kalimba: the cold, circling motif suits metal tines perfectly. The range is compact — C4 to E5 — so the piece fits both 17 and 21 keys with no transposition at all.

The tempo is slow, but don't let it fool you: the expression lives in evenness and gradual build-up. Drill the motif in Learn mode, then switch to Play and keep the repeats equally loud. Chord spots can be played as single top notes at first — the melody survives just fine.