I was writing a lower harmony to an existing (rock) lead voice with a given chord progression and there is a point in time, where it seems like the two voices need to sing the very same note. The only alternatives to this are: Letting the second voice jump around alot (which does not sound right to me), making the voice generally lower (but I want the voices to stay relatively close to each other and it sounds dull to me anyway) or changing the lead voice (which I simply don't want to do, because it was already existing for quite some time).
The question is: Is it "acceptable" to let the two voices sing the same note occasionally? Are there any notable examples of works or rather popular songs where this happens? Or would people think, that it sounds strange and/or that I am just a lazy composer?