I got this idea from Kristy Placido in an online conference through tprspublishing a few years back.
Basically I used to just show a song for one day of the week and we would listen to it and do a cloze activity. It was the favorite day of a lot of my students. We would go over the lyrics and listen to it various times. But there was never really much of an extension activity.
I don't see a huge problem since my most important goal was to expose them to new things. The songs could have similar and/or different perspectives and we could have a quick talk in L1 or TL about them as needed. Since storytelling revolves around high frequency structures, this is a great activity since many songs will have some part with comprehensible language that we can see later creep up in stories.
I also noticed many of the kids downloaded the songs that year.