Castagnari Tommy D-G Diatonic Button Accordion Castagnari Tommy D-G Diatonic Button Accordion. The Castagnari Tommy (D/G) is a premium diatonic button accordion crafted in Italy by Castagnari, one of the world’s most respected accordion makers. Renowned for its exceptional tone, craftsmanship, and playability, the Tommy is a favourite among folk and traditional musicians who value [...]