The person who tunes a musical instrument in his dream will direct his own life and succeed with good, accurate decisions. Seeing that the instrument is tuned in a dream indicates that one will make the basic decisions about his own life. Tuning indicates free will.
According to another dream interpreter, seeing yourself tuning any instrument in a dream indicates that your work will be very corrupt, you will encounter many troubles, and your efforts will remain negative for a certain period of time. Tuning indicates that you are working hard but your efforts will be wasted.