Company Beijing Qule Technology Co., Ltd. created these great apps:
智能吉他, 听音识谱练习, 节拍器(超好用的节拍器), 吉他调音器（最好用的调音器）, Sheet Music Bar - help you to learn piano & guitar, Guitar Tabs & Chords - Best app for guitar player, 弹琴吧-钢琴谱吉他谱分享平台, 弹琴吧钢琴陪练, and others..
