Cee Lo Green’s too busy to open for Rihanna. (AP Photo/Matt Sayles)

- Remember that classic episode of “The Simpsons” with an uncredited Michael Jackson? Turns out it was MJ providing the voice of “Leon Kompowski” but due to record label restrictions it wasn’t him singing on “Lisa It’s Your Birthday.”

- If you had to pick the artist who would be first to release an album on Groupon, David Gray would be on the short­list, right? Well now you can get a live album from the singer-songwriter as easily as you can get $20 of materials for $10 at Stitch DC.

Clicky shuffle: Your random song for Tuesday morning:

- Os Mutantes, “Bat Macumba”