At 76 in exp groups I have 1 or 2 spell gems that I never really use. So, with that in mind, I don't think this song is worthless. It just depends on your situation and what you're trying to accomplish. Here's why it's NOT worthless for me:
1. I box with a bst, tank merc, and cleric merc.
2. When I'm grinding or running missions, I always pull multiple mobs. I usually have 2-4 in camp.
3. Inevitably, something goes wrong. Maybe I get an add, or a couple of slow resists that cause the cleric to go oom, or something like that. When that happens, I need to burn mobs down fast. That's when I start hitting all the AA dps utilities that I have, the dps discs, etc.
4. I have about an 11-12k mana pool, and it NEVER goes low normally. I very rarely have to fade, so I always have 90-100% mana. So with that said, if it comes time to burn mob downs fast then I can throw this into my twist. Then, suddenly, I'm doing 2258 damage every 3 seconds to every mob around me. Add maxed spell crit AAs (for my level) to the equation, and it adds a really hefty boost to my dps burn.
So, as usual, when someone says a song is worthless I'm left saying that it just depends on your situation. Almost every song has some purpose and some use.
Azhira - 76 Bard, Maelin
Cathaldus - 76 Beastlord, Maelin