There are many music practice books come with CD. Those CDs often contain multiple phrases in a single track. While practicing one phrase repeatedly, it is a bother to seek to the head of each phrases.

Listeing mate has AB repeat feature, so it is the best app for this kind of practice. You can easily set the start / end point of AB repeat by dragging AB repeat bars on the waveform.

Listening mate can also play in various speed, it is very efficient to practice in slow speed at the beginning, speeding up gradually.

“Have an effective music instrument practice anytime anywhere with listening mate.”

Listening mate is a language learning assistance tool.
It helps your listening (or shadowing, dictating) training effectively.

The core features of Listening mate are AB repeat and playback speed adjustment.
It helps you practice a certain part of a track repeatedly and it can be used for
fast speech listening.

Listening mate can play any mp3 and wav files stored in SD card.

“Have an effective listening training anytime anywhere with listening mate.”

Andj is a DJ application provides easy and compact controlling of DJ performance by utilizing touch panel of Android handsets.
It enables just as much DJ performance as other DJ performance player. By installing Andj to Android handset, anyone can enjoy DJ performance at anywhere (even where external power supply is not available!).

Andj shows the total waveform and zoomed waveform of the playback position seamlessly, so it is very easy to recognize and change the playback position.
It supports a configurable cue point (to easily jump to a particular position) and adjustable tempo control. It supports direct playback of Mp3 file, automatically recognizing songs in the handset. Just connecting an Andj installed handset to DJ mixer, DJ performance such as mixing two tracks becomes available just like other DJ performance player.

More detail about Andj