Ds 3rd birthday party food and music help please

[Tysonandthehouseelves86]

Hello, organising ds's party abit early as have to make a booking in the next 4 weeks.
He will be 3 in June. He will have 9/10 guests, one being 9 months old (baby sister) and the oldest being 6 years old.
This year he has been to various parties and I want to give him his own party. I am looking into booking a bouncy castle party at the local leisure centre, an hour with the bouncy castle and an hour in the function room for food and cake and music.
Has anybody got any ideas as to what food and how much to prepare? I am not feeding the adults
What music that wont send the other parents and my mum mad?
Any other ideas as to how to make the function room part of the party brilliant would be appreciated as Im concerned it will be just eat and run, or is that the point?
HELP

desperate and shameless bump :)

i'm having ds 4th party this weekend at a bouncy castle place and food will be:

ham sandwiches

nutella sandwiches (with the bread with no crusts)

carrots/tomatoes/cucumber/cheese, humous

hoola hoops

various biscuits: party rings chocolate fingers

mini sausages (which i will cook at home and wrap in tinfoil

strawberries/blueberries/grapes

cupcakes

a bottle of water each

then a slice of cake to take home

i think thats enough really

i think i will provide something for grown ups to snack on, though not sure what at this stage!

good uck....i'm dreading it!