Do you have a music basket or music shelves in your home? When Otis was an infant we had a plan toys drum on his low bedroom shelves. He would crawl over and loved sitting there banging on his drum. Over the years we've had lots of variations of a music basket including lots of rhythm instruments. Here are a few music baskets and shelves I really love, they are all very unique, enticing and beautiful!
Pentatonic-diatonic Glockenspiel at How we Montessori / Music Basket at TinkerLab
The baskets are displayed and used almost like treasure baskets, for the child to explore. The shelves are true to Montessori principles, they have order and there is a space for everything. We introduced a CD player in the toddler years, play silks make a nice addition to music shelves too!
For instruments I feel inspired by these, I love the natural look and feel and how you can combine some cultural studies into the experience.