It features music from lots of different adaptations, has a stab at guessing some of the solos Irene Adler may have sung, and also the Polyphonic Motets of Lassus. 😉
If any non-British people are not aware, the Proms are an annual classical music festival. They do all sorts of things, including a Doctor Who prom, and now a Sherlock Holmes one. I only wish I had known about this one previously and got a ticket, because I love listening to the music of the canon!