 Now by Johnny Nash. Your version can be upbeat to kickstart your day. It can be melodic to vibe out to. You send that recording. It should be 30 to 60 seconds. You can go to mixtape.cbsnews.com to submit your version of the song and find the rules and the details of the contest right there. Now later this summer, here's where it gets really cool. Our viewers will help choose the winner.