To give you an example to get you thinking, I did some searching and found this suggestion for a music profession which would let players create their own instruments and play their own music -- something I hear Lord of the Rings Online implements very well. (The clip above features a LotRO player using his keyboard to play "Dust in the Wind.") In addition to this, "song-spells" or enchanted instruments of some kind could give a benefit for anyone in range to hear them played, such as a short-term buff or heal-over-time, or else a debuff for enemies within range, such as a short charm or a lullaby. Some have suggested that a "Bard" class would be able to do this, but to me it seems that the "singing" mechanic suits a secondary skillset better than a full-fledged class and also opens it up for more people to learn and use in different ways. What's your opinion?