Yes, we have a session called Choose Your Own Soundtrack which lets you do exactly that!
You can fully customise the length and also the type of sequence for the Choose Your Own Soundtrack session. There are two versions of the session:
Choose Your Own Soundtrack (found in Relax and De-Stress)
Meditative Sequence
Relaxed Sequence
Intense Sequence
Choose Your Own Soundtrack (Sleep), (found in Sleep Better)