looking at http://test.musicbrainz.org/cdtoc/attach?toc=1+3+60990+150+20282+40957&artist=615863 it's quite confusing and could use more whitespace around each release. I think now we have release groups, we could use the release group names as headings to help split it up see the mason version of the page - http://classic.musicbrainz.org/cdi/searchartistrelease.html?artistid=615863&discid=NnuGMiyOSdFHJ255QeKwjGsGXcQ-&tracks=3&toc=1%203%2060191%20150%2020282%2040158 - the releases are much more distinct on the page there even without any reference to release groups