SoniAni: Super Sonico The Animation

Both are musical moe shows about cute girls,however Sonico has a little more ecchi.Nonetheless both shows are adorable and have their funny and heartwarming moments. 

Although different by music genre (metal/pop rock), both are about music band consisting of three members and relationship between those members and people around. Both are comedies. 

Both being based around notable video game titles as well as having music elements and stylish visuals and art in it as well too. 

both have a female cast and are based around living a life as muciscians and light hearted slice of life comedy. 

- Both have music story - Female characters trying to be idols - Female Singers And Dancing  

Both anime involve modelling / cosplaying and the main characters, (Aya and Sonico) have almost the same looks. Both anime includes certain events that would lead the female leads to embarassing moments, often involving a large crowd and ridiculous outfits. Both are somewhat plotless and mostly focus on fanservice. 

Both are a mix of slice of life and being a muscian and also comedy elements throughout and having a female mc too.