Massey Hall is still open and is a great venue to see a concert. I had the priveledge of seeing Prince there a couple of years ago and was only about 20 feet away.
The gasworks is was unfortunately a victim of the death of the rocker bar - now the young folks prefer to hang out in the "club district" around Adelaide West. The Brunswick House is still going strong (although I have not been there for years and not sure Irene is still working downstairs). The live music scene is alive and well in this city and that is one of the things I like about living here.
Now that we are "older" we like some of the bars on College Street - lots of live bands a bit more our speed.