A real, honest to god, pipe organ. Some of the best make sounds you can not hear, but feel instead. The experience is incredible.
Bossendorfer or Steinway Grand Piano. :)
guitar or piano. Guitar because it's cooler, piano because you can play a variety of songs
I (Guess I !) have to also say "Drumset". Then "all Percussion".
I've been drumming about 45 years..... the last 30+ professionally.
( I play other instruments too. And,I started EL. bass for the 'new Century'!)
Sax. My daddy played sax in a swing band in the 40's.
the violin and koto :)