Any genre is good. Singing or playing an instrument. I don't know if other video sites would work or not but it needs to be posted on a video site like youtube and a link added to your steemit post to have a video play on steemit. You can vote on their posts or on the links they leave in the comments of this post or both.

Here's who played last week and here are votes from last week on the contest page but people also voted on their posts.