A free app for Android, by iJoysoft.

Equalizer Pro is a free music player app with a five-band equalizer, bass booster, sound changer, and volume amplifier. It supports all major music players and media players. You can also use the equalizer to adjust the sound effect levels so you can get the better out of your music.

It includes professional preset sound effects such as Normal, Classical, Dance, Straightness, Folk, Heavy Metal, Hip Hop, Jazz, Pop, Rock, Acoustic, Bass_boost, Treble_Boost, Vocal Boost, Headphone, Deep, Electronic, Latin, Loud, Lounge, Piano, and RB. 

Make the best out of your music and customize them to your preference with this app.