Given the sentence "A concert in which the two people on stage both hold guitars." is it true that "People are at a concert."? Now, let's be accurate as possible. Some thinking first:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A concert can have a band playing guitars on stage with an audience. So, the answer is yes.