The Lanzhou Painted Pottery Museum (兰州彩陶博物馆 Lánzhōu cǎitáo bówùguǎn) opened on 28 November 2011. It is located in the 'Golden City Pass' Culture and Customs Quarter on the north bank of the Yellow River, near White Pagoda Hill Park (map). Chinese news story here. Photos here.
Originating in Shaanxi Province, the local variety of Chinese opera is Qínqiāng Xìqǔ (秦腔戏曲). You will come across locals singing Qínqiāng in the parks, and there are more formal performances in the afternoons in the teahouse at Huáng Miào which sound like this:
Now you can find out more about this regional Chinese opera by visiting the new Qinqiang Opera Museum in Lanzhou, on the north bank of the Yellow River. It is part of the ever-developing 兰州金城关文化风情区 Lánzhōu Jīnchéngguān Wénhuà Fēngqíng Qū). It is good to finally see this area taking shape. It certainly looks impressive at night, but up until now there hasn't been a great deal to see and do there.
Read more about it here and here.
Not being in Lanzhou these days, I won't have a chance to visit this museum in the near future. So, if you do visit, please comment below.
Chinese: 中国秦腔博物馆 (Zhōngguó Qínqiāng Bówùguǎn)
Getting there: Map
Other museums: See here