Music Copyright

I run a small video production business and I would like to know if I can use copyright protected music in my client productions if I credit the author of the music in the credits?

The video is a promotional piece for use at my clients trade show booth.

thank you... jesse

Not to be rude..
This is a work comp forum, not a copyright question forum..

sorry

i'm new here I misplaced my question... it won't happen again!