Period from end of <a href="https://en.wikipedia.org/wiki/Sixteen_Kingdoms" class="extiw" title="w:Sixteen Kingdoms">Sixteen Kingdoms</a> to <a href="https://en.wikipedia.org/wiki/Northern_Wei" class="extiw" title="w:Northern Wei">Northern Wei</a> (384-441 A.D.) image from the <a href="https://en.wikipedia.org/wiki/Tomb_of_Lord_Yanju" class="extiw" title="w:Tomb of Lord Yanju"> tomb of Lord Yanju</a>.  Shows musicians playing (from left) waist drum (细腰鼓), flute (长笛), lute (阮咸琵琶), and <a href="https://en.wikipedia.org/wiki/Guqin" class="extiw" title="w:Guqin">guqin</a> (古琴). On Wikipedia, this image was originally represented as being from the Sixteen Kingdoms period; however nothing online supports this, as of September 24, 2018. All the copies I have found of this particular version of the image (cleaned up, unlike the other version below) originated with Wikipedia. Wikipedia appears to be the source of this clean copy online, as well as any information dating it to the Sixteen Kingdoms period (304-439 A.D.).
Unknown author<span style="display: none;">Unknown author</span>
420–589
Ancient Tomb in Ting-chia-cha (丁家閘), <a href="https://en.wikipedia.org/wiki/Jiuquan" class="extiw" title="w:Jiuquan">Chiu-ch'üan</a>