Is this audition/singing event a scam?

okay, so I went on craigslist and foud this ad under artists for a person looking for a musician. i emailed whoever posted the ad and was like you can check out my youtube channel at msstormywatson and i am really interested in music/singing. they emailed me backa nd said they already had some1 for that event but would def get back to me ifthey needed some1 else for another event. well, they emailed me back1 week later saying they needed a national anthem singer and would I like to do it. then they asked what I would charge to do it. i showed my mom, and shes like-freaking out. she dosent think i should do it-hbu??