HaruChika: Haruta to Chika wa Seishun suru

The pace is quite similar, both animes are about high school students resolving mysteries, and one of them is quite smart. 

An anime dealing with band orchestra music. The main female from both anime joins the music club. In Euphonium, she already knows how to play while in Haruchika she is a beginner, Both female main characters are aiming for the nationals. The teacher in both anime are very similar. Yet their teaching methods are different. One has romance while the other not so much.  

HaruChika and Shigatsu wa Kimi no Uso both employ the soul of music in their respective series. Both anime depict the importance of friendship and how it can overcome the different problems and puzzles in life. The two main characters are both musically inclined in HaruChika and Shigatsu. If you want to comfort your feelings with soothing music, then you should watch these anime series.  

Both have the same music and drama genre where the plot was about a club that was about to face closure when group of first years decide to give it a new lease in life.  

Both involves a club that was about o be disbanded when a group of 1st years decided to save it.  

Episodic mystery series that tackles about the personal problems of other people surrounding them. The stories portrayed on each episode has the same feel and can be actually related to reality. 

Though Haruchika and Detective Conan differ in terms of setting (HaruChika focuses on school and clubs while detective conan has a broader aspect), they are closely the same when it comes to the mystery genre. The first episode of Haruchika displays an interesting mystery puzzle that needs critical thinking and analysis, the same as the anime, Detective Conan did. Haruchika and Detective Conan are anime for those people who likes logic and riddle. 

Both anime feature small art (music or kabuki) club with more members joining as the plot goes on 

Tari Tari and Haruchika both deal with music. Tari Tari deals with singing while Haruchika deals with band/orchestra. Both anime made by PA Works. There is romance in both anime and slice of life too. 

Both has episodic style of main character(s) solving some mysteries that involves people around them, and sometimes, those mysteries has a certain level of dramatic or even tragic past for the character involved on it.