Confession time: I don't "get" bards as a character concept. I have a hard time imagining a cool character whose main power is music or singing during a fight; that's always seemed kinda lame to me.
The problem is not singing, but wanting to frame everything into combat, and using combat as the ultimate measure for everything.
You could have a character of the Wizard class perfectly represent a Bard, without worrying whether she is ever singing
during a fight.
But you could also have had a Bard class with some
mechanics associated to singing, only not necessary while fighting.
If there is any lameness, IMHO is in simultaneously allowing some Bardic features to be usable instantly (i.e. one action or less, therefore usable in combat) but requiring a musical instrument, especially since nearly all of them require two hands. The sight of a hero jumping around the battlefield singing and rhyming with a guitar is comical at best (quite Monty-Pythonesque to me) but this can be totally inappropriate if the campaign is serious and not comical.
In most cases, narratively it would make a lot more sense for Bards to use their performance-based abilities
between combats, when they have all the time and comfort for such performance. And it sounds a lot better than
a whole song is magically capable of healing you up or insiring you, rather than a 6-seconds excerpt... [This doesn't mean that Bards should have no such capabilities... in fact they have
spells, and even tho I am not sure whether the final PHB requires instruments to cast Bardic spells - which would be indeed lame - there is no need for every single Bard feature to actually require music or performance]
And then of course I see stuff like this, and I totally throw what I just said to the garbage
https://www.youtube.com/watch?v=S5UVMIrv0Yc