Roger Waters can't help making his feelings known about other musician's gigs. Although he usually saves his open letter diatribes to spotlight the plight of the Palestinians to artists planning shows in Israel, this time pop group — and Super Bowl Half-Time stars — Maroon 5 is the subject of his public ire, for choosing to perform for the NFL in light of others refusing to due so in deference to former San Francisco Quarterback Colin Kaepernick.

In a post on Facebook, Waters uploaded footage of him and his band “taking a knee” onstage and writing in part: “My colleagues Maroon 5, Travis Scott and Big Boi are performing during the halftime show at the Super-bowl this coming Sunday, I call upon them to ‘take a knee’ on stage in full sight. I call upon them to do it in solidarity with Colin Kaepernick, to do it for every child shot to death on these mean streets, to do it for every bereaved mother and father and brother and sister.”

Rolling Stone posted that as part of his statement, the Pink Floyd co-founder “also said he supported a petition asking Maroon 5 to drop out of the halftime show. It has amassed more than 112,000 signatures so far with a goal of 150,000.”

Roger Waters explained that rebelliousness and independent thinking have always been part of his makeup: “Yeah, I always have been that way. I spent a lot of time in the education system in England, which by and large was pretty good. But, when I went to my secondary school, which was a grammar school, they were pretty much of the 'sit down, be quiet, shut up and listen' school of education. We had canes and stuff like that, so there was plenty to rebel against — but then I've always been politically active, so when I was a kid I was involved in the Campaign for Nuclear Disarmament and other organizations like that.”