Home / Forums / Melodica construction, repair and maintenance / Material test on Yamaha P37D / Reply To: Material test on Yamaha P37D Reply To: Material test on Yamaha P37D May 11, 2015 at 8:13 pm #5018 Alan BrintonParticipant I haven’t yet gotten together with my friend, Daren. He has been pretty busy with seasonal work on his day job, but it’s probably time to meet with him and show him some naked melodicas.