Came here for their adult evening = Studio Bell after hours. It was great! They dim the lights and have live music/djs playing in different rooms. Great atmosphere for exploring the music museum (5 floors total). Many instruments to play with and make music. There are also stations where a video will instruct you on how to play a specific instrument (e.g piano, guitar, drums). Bonus is that at every station (educational or practice) there are 1-2 headphones to minimize noise pollution. There's even a sound booth that will record you singing "karaoke" to see how well your vocals are. Ahem, "do-rae-mi..."
During these evenings, snacks and beverages (alcoholic and non-alcoholic) are available for purchase (cash only). Lots of fun. Beautiful architecture. Highly recommended.
Ps. Purchase tickets in advance as it will/can be sold out. Best part... No kids running around Hehe.