It would be nice to have a search field where we could type the name of the music instead of scrolling up/down to it. It’s already been done for the lists of backgrounds and animations. Very practical!
UPD: Could we have a play/pause/stop button for the sounds as well? Right now, there are two ways to stop the playback once it’s started: to mute it or to reload the page. If you mute, you have to unmute to listen to the next sound. And reloading the page isn’t the best solution when you’re coding.