So Foe's Requiem can be a good skill to use when your other songs are not needed. Face it, it doesn't deflate DPS and can seriously inflate DPS for those using elemental damage (which is a skill or two for nearly everyone). What's tough about it is that it creates an aggro radius around the bard and seriously dinks up pulls in dungeons.

If it were a passive area debuff without aggro, then I would see it put up more often in dungeons and the bard would be doing more singing than just OOM and OOTP moments.