Harmonica, Shaw, Flute, Guitar, Violin, Piano. The difficulty of learning these instruments is ranked

Guitar, piano, violin these three actually have their own difficult, but because it can not be compared, the guitar is a plucked instrument, the violin is considered a stringed instrument, the difficulty of these three is not similar. The second level (difficulty level) is the flute and Xiao, both belong to the folk instruments in the blowing, the difficulty is about the same, relatively speaking, the harmonica is the easiest.