You don't get the point: communication with your teammates.

The songs you sing depends on party setup and battle strategy.
If you know what you should do, then let your party know what you will do and when. This way, they will know you're not another lolbard and will adjust their own playstyle to your songs.
If you don't know what you should do, then ask your party which songs seems better, or if they need specific songs at specific times.

It's your jobs as a bard