Just in case you don't know what JAM Live Music Arcade is all about, this pair of new vids will get you educated on its dual modes of play.
JAM was actually billed as a 'musical sandbox' of sorts, meaning that you could play around with the thirty-some-odd included (and licensed, so no covers) tracks and put together your own compositions. And that's true, but developer Zivix also wants to make sure you know that there's a full on gee-tar strummin' rhythm game in there too.
And about that JAM mode...
JAM Live Music Arcade is available now on Xbox Live and the PSN.