Song's are good when you get into longer or more intense fights (I had a Garuda where we killed 6 sets of sister pop~! omgosh!)
White mages benefit from mage song often because they have no MP regeneration ability (Breaking my immersion since I should be able to 'draw from nature' D:)
And when you are in a longer fight either grouped or solo you can get a TP boost by singing to yourself hehe
I have not played BRD often enough to think of other uses atm <3
