Based on some research done years ago, we used to use a tape player (to show you how old this was) to play music in the background during our sessions in Atlanta. 60-beat Baroque (e.g. air on a G string, Pachelbel Canon) definitely helped people into the middle frequencies, especially alpha. Mozart, the faster sections of some of his works, especially with higher pitched solo instruments (clarinet, violin) tended to help people produce a beta state. We played these in the background and were regularly asked to make copies of the tapes for kids or parents to have at home. Of course, now I would just download it or rip it from a CD and play it in the background in the Audio Player (if you are using BioExplorer).