Uta no☆Prince-sama♪ Maji Love 1000%, PriPara Recommendations
They are both music themed, and have idols in the series. They are also aimed towards girls, except Pri Para is aimed towards younger girls, while Uta no Prince Sama is aimed towards older ones. The only difference is that in Pri Para the main character is in grade school and the main character in Uta no Prince Sama the character is in high school. To wrap this up, Pri Para is pretty much a gender-bent version of Uta no Prince Sama and vice versa.