Guitar and Bass Ear Trainer - Version 1.5 Play-along ear-training course for guitar, bass, and other fretboard instrument players. Learn to play effortlessly by ear. Develop the ability of playing whatever is in your mind without hesitation and without mistakes. Improve your improvisation skills. Develop your ability to listen one or twice to a song, to a solo, to a bass line, and then play it back exactly right the first time, without hesitation and withot fumbling around.