':param op: add or del
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def op_music_to_playlist(self, mid, pid, op):

    url_add = (uri + '/playlist/manipulate/tracks')
    trackIds = (('["' + str(mid)) + '"]')
    data_add = {'tracks': str(mid), 'pid': str(pid), 'trackIds': trackIds, 'op': op}
    return self.request('POST', url_add, data_add)
