This may sound like a silly question, but how many percussion instruments can I use for three players (other than the timpani and celesta players)? I like variety in percussion, but I don't want to get disqualified for having too many instruments. Does three players mean three instruments, or can I (safely, for a normal professional orchestra) score for more than three in the work if I allow the three players reasonable time to put one instrument down and pick up another (and rest)?