Found an old clip with Paul in the studio, and would love some help identifying the song. Searching for lyrics or using song recognizers brings up nothing.

Found this old clip with Paul from his Wings period. I can't seem to find the song anywhere, but it's groovy as hell and he sings some beautiful A4s. Is it a real song, or was he just having fun in the studio? I know for example that the ending to Cry Baby Cry was just Paul fooling around, and they ended up sticking it onto a track because they liked it.