Use save tp / regain atmacites so you can trigger weapons and be useful between songs.
This.
Usually at the start I put on debuffs and spam magic like Dia II/Flash/Threnodies, calling out hints. Once we get the first red proc or if the extreme proc is really easy to get, then I usually head in to melee, putting in any dmg I can (generally with Plenitas Virga and Shattersoul/Retribution, depending on buffs/VWNM) and/or help with WS procs.
If songs are up and your party is stable, there really is no reason not to.
For the few mobs that don't really use AoE TP moves (such as Akvan and Qilin), it's also nice for the meleein Brd to be able to use Fool's instead of Fanatic's, since the Brd
shouldn't be taking hate with their dmg. Fool's will block any AoE debuffs on the Brd and allow the Brd to quickly use Healing Mists/Cleric's drinks on the DDs around them to heal them from sleep/status effects/dmg.