Why a Laptop orchestra, rather than a tablet orchestra, or phone orchestra?

Why a laptop orchestra? Why not a Pi orchestra?

We will have laptops for the Laptop Orchestra and can set up a Pi Orchestra for Pis if we want.

The laptop is a good platform for the sort of work we want to do because it is easier to run Linux and programs for development on laptops, for an orchestra that includes the ability and capacity to build its instruments is central. 

Laptops take more accessories and interfaces than tablets and phones.

Laptops are portable unlike desktops.