Learning how to play your musical instrument by ear is a skill that is vital to your development as a musician. While reading music is also a valuable skill, in many forms of music—folk, old-time, bluegrass, rock, Celtic, blues, country, jazz—you are not typically going to have a music stand sitting in front of you at a jam session or stage performance. Also, in these genres of music, it is very likely that a given song that you want to learn will not be available to you in written form and so the only way you will be able to learn the song is if you know how to do it by ear.
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