I noticed some gifted musicians are very easy for them to fix the tune of their guitars. They were blessed through hearing, but others are not, some musicians have difficulties in fixing the string sounds, they need gadgets like guitar tuner online mic just to get the best tune of their guitar. For sure two kinds of musicians i noticed, one is a gifted musician that are also very good hearers and other one is a hardworking musicians, though they are not hearers but they perform well because of hard practice.