Separate tips for separate elements????

A friend and former student of mine (who happens to be a musician sent me the attached photo and asked me for my opinion.  The bill has two separate lines for tips – one for the food and/or drinks and one for the live music.  You can understand why the owner might want to separate the two – it allows them perhaps to pay the musicians less and ask the guests to fund the musicians.  It seems reasonable at first blush but I think there are some inherent problems.  Its clear that musicians add value (at least hopefully) to the experience.  A tipping convention would then have them share in the tips as an appreciation of that contribution.  

My fist concern is that this approach highlights just a single source of additional value. The staff in the kitchen add value to the experience but are not highlighted differently.  Its clear…