Any profession can gain experience on par with fishing by playing their instrument to an audience of at least one other PC. Experience gained is capped at 1 hour's worth per day.
The syntax for playing an instrument is
<style> play my <instrument> with the style being:
joyfully. You need to remember to
tune your instrument if you notice your quality of play drastically decrease. When you are done, you can
stop <instrument>. You may also
play my <instrument> <message> to emote using your instrument and gain experience as though you were playing it.