Upvote:4
The UK visa policy is that only one type of permission can be valid at any given time. You were in the UK as a student, and departed. You then applied for a visa that would allow you to be in the UK to work as a musician.
Making a second, separate application to visit is risky, as you've already informed the authorities that you would like to return there to work. You might invite a refusal on one, or both, applications. Perhaps it would be wiser to await the decision on the more important visa, the one that would let you perform with your band.