I've been considering using the Mislead spell to do some snooping around as a bard. The full spell description is here:
You become invisible at the same time that an illusory double of you
appears where you are standing. The double lasts for the duration, but
the invisibility ends if you attack or cast a spell.
You can use your action to move your illusory double up to twice your
speed and make it gesture, speak, and behave in whatever way you
You can see through its eyes and hear through its ears as if you were
located where it is. On each of your turns as a bonus action, you can
switch from using its senses to using your own, or back again. While
you are using its senses, you are blinded and deafened in regard to
your own surroundings.
Since bards are performers by nature, using the illusionary double to perform seems very doable, but since it is only an illusion, and the spell doesn't mention if it can create sounds other then speaking, I have some questions about the mechanics.
Could a bard make his double perform as a distraction while he tried to sneak around or would the illusionary double not be able to convincingly perform due to it being only an illusion? Would a bard with a lute actually be able to have his double convincingly play the lute as the spell specifically only mentions speaking and not any other sounds?
It's ambiguous, but I would err on the side of yes.
The only justification in the text to allow the illusion to play music is this part:
Which is not super convincing. However, here's my argument for why it should be able to play: