It would be a ten but it's hard to enjoy if it was longer and your theme is usually the same as all of them at the beggining
How about using a whistle or a tone like it i have a piano and it has different settings
Grand piano, pan flute, etc............... it can go for a while and there's a rythem on ity as well
IF you would consider a hardcore ryhthem like guitar or a light instriment i would enjoy and love to listen to it.
Or combine the both of them and make a ryhtem all your own orignal i'm pretty sure they say so