The page for an artist now also includes links to tribute albums
(compilations of covers of that artist's songs). Gronk now refuses to
queue a song if it is already on the playlist (to avoid accidental
multiclicks). The search form now lets you list recent additions
within the last N hours or days. A page is generated that lists bands
who appear only on compilation albums. Some minor code cleanup (Perl
de-squicking) has been done.
