At first I had no idea what this Chinese musical instrument is called. I asked my colleague & I was told that it's the Erhu. As stated in Wikipedia, the erhu (二胡; pinyin: èrhú, [êɻxǔ]) is a two-stringed bowed musical instrument, more specifically a spike fiddle, which may also be called a "southern fiddle", and sometimes known in the Western world as the "Chinese violin" or a "Chinese two-stringed fiddle".
Well, the photo was taken 2 nights ago & this Chinese guy was nonchalantly performing with his erhu at Sembawang MRT bicycle park. And soon he's joined by 1 lady who, gues what, was singing! And soon, an old man and a small boy joined too (watching only, not singing). Great performance...and well, free. Heh.
PS. The first photo was just a normal shot without Night Scene option whereas the second photo was with Night Scene option.