Honestly the song for Girls Band Party Pico sounds exactly like the one go Isekai Quarter...

(Heres the link to both songs so you can make your own opinion...)

Girls Band Party Pico: https://www.youtube.com/watch?v=9f5ePPMloRo

Isekai Quarter: https://www.youtube.com/watch?v=CFnK2H0KxB8

edit: I don't know if its the chibi characters or like the happy tone of a lot of characters combine...