There is Xinghai Musical Instrument Store at the south entrance of the square. I don't know which one you want. There are many kinds of harmonicas. If you are only interested in learning, just buy one around 30 yuan. If you have special needs, it's hard to say. It must be expensive. I saw a small harmonica there. I like it very much, but I can't play. Let's buy a more popular one. ...

It is estimated that harmonica is available in all musical instruments, and the teaching materials are available in Northwest Bookstore.

Look here.

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or

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Or you can look for it on other video websites.

If you want to find a teacher, you can go to the music store and ask.