Is ourstage com a scam

Answer 1

I would say NO because a scam implies somebody is going to get money from you for doing nothing.

Ourstage (I have my material there under "Mark Murphy") gives you a platform (Link) to showcase your music and to share it with others and it free.

I do have my doubts as to the veracity of the contests. It has been my experience in music contests that there are either too few judges to listen too far too much material being submitted (or) bands with the biggest followers get the most votes - which effectively weeds out unknowns who while may be musically superior, don't have a large group of "cheerleaders" casting votes for them. This gives the illusion they must be "the best" Its the old "If a tree falls in the forest and nobody is there to hear it, does it make a noise" idea.