Hi salsa. Fantastic news!!! DS is in Y7 and loves it at DGS. He has one to one music lessons and missing lesson time doesn't cause too many problems - I'm sure he would complain loudly if it did. His teacher changes the music lesson time so he doesn't miss the same lesson each week. There are lots of music activities to choose form - DS is in R n B band, concert orchestra and junior choir. He's also in a band with some of his friends - they rehearse in one of the music rooms at lunchtime.
We didn't express a preference regarding the language options. DS studies Japanese and loves it. In Y8 the boys choose either Latin or a modern European language - DS has opted for German. I think they may be able to study a new language ab initio in sixth form as part of the IB (but you'd need to check that) so it might be possible to do Mandarin and Japanese.
Please feel free to ask me anything else. Well done to your DS