We provide you an easy and professional way to appreciate and study the Mei school Beijing opera play "Remorse at death". We invite you to watch our teaching and performing videos which cover the overview, close view, hand gesture, feet gesture, teacher, students and band multiview. We clarify the Beijing opera singing elements - pitch, volume, beats, special pronunciation by intuitive visualization. All videos used by this app are under Creative Commons Attribution-NonCommercial 4.0 for non-commercial usage. These videos can be downloaded from this link (https://doi.org/10.5281/zenodo.1299208). Content: 1. "Remorse at death" play's costume, gesture, teaching and performing multiview videos downloading. 2. "Er bian xiang" singing practicing tool. 3. Classical aria "Er bian xiang" singing visualization including pitch track, volume, beat positions, jian and tuan characters and special pronunciations. 4. "Mei school singing audiovisual and computer-aided teaching" project articles. Functions: 1. Multiview videos switching. 2. Singing visualization, including waveform, pitch, note name, beat position and special pronunciations. 3. Academic articles reading. Made by Mei school successor, National Academy of Chinese Theatre Arts professor Zhang jin and technically supported by Music Technology Group, Universitat Pompeu Fabra, Barcelona.