Here are the components for a very simple relaxation track, made up of a marimba chime and crashing waves on the shore. Both marimba and waves are available in separate files.

The waves are synthesized so there is a regular rhythm at 60bpm. This is not entirely obvious to the listener due to a second wave track layered underneath at lower volume and slightly out of sync.

The stems should work at any multiple of 30bpm (e.g. 30, 60 90…), so are suitable for relaxation music or anything that needs a down-tempo chilled out feeling.