I also added a few more general subject keywords:
comedy - posts about comedy performances (rather than, or in addition to, music performances)
movie - posts about movies or films
radio - posts about radio shows or stations
review - writing about a show after it happened
story - posts where I tell a story (kinda)
venues - about venues, rather than just mention a venue in connection with a show
house concert - for any house concert
For postings about shows outside the Boston area, I added some geographic keywords. So far, these are western mass, colorado, connecticut, and new york.
... and other as a general keyword for posts that aren't about specific shows.
Are these useful? Are there any other keywords you'd like to see?
[Note: On a few posts, one or more keywords are missing because LJ sets a limit of 5 keywords per post.]