Should I submit generation again if a Music or Interpretation API request times out?

A timeout only means you did not receive the response in time. If you have a projectId or jobId, check that project or job first. If the first response never arrived and the operation supports idempotent retries, retry the same operation with the original Idempotency-Key and identical request content. Music’s RECOVERY_REQUIRED and Interpretation’s RECONCILING mean the result is still being checked. Neither is a reason to start a new generation or assume a refund.