Bard song spreadsheet:
http://www.project1999.com/forums/sh...d.php?p=420134
Sham and Nec (typical DoT classes) can easily out-DoT bards.
Bards can maintain the instrument effect of the song throughout the song's duration if the appropriate instrument is equipped as the song completes casting. If an instrument was not equipped at cast completion, specific ticks can be improved by having an appropriate instrument equipped as the tick occurs. (I am unsure if this is a bug or not, but it's accurate behavior for P99.)