That would cover the software side, but have you thought about the licensing stuff already? This is going to cost more and takes a lot more effort to license the videos. Also where would you get the videos? They aren't sold on CD or in online stores like iTunes and you'll have a hard time getting a license for a clip copied from youtube or mtv.
Even for displaying the cover art you'd need to get a proper license from the artist or the label (if the artist granted them permission to sublicense their work)
Oh right, I forgot the license, sorry about that
. Well there is no problem downloading the music video from YouTube, if they don't want some licensing stuff they can always use their live cameras or "royalty-free" graphics. I know it would cover the software side since I know Sam broadcaster is meant for Radio Automation Software, but this feature would be a nice addition for SAM Broadcaster.