To add a video for Mexican Anonymous / Marcha a dúo de Jerusalem (attributed to Ignacio Jerusalem; Ms. T-4 53, Museo Nacional de Antropología e Historia), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Mexican Anonymous / Marcha a dúo de Jerusalem (attributed to Ignacio Jerusalem; Ms. T-4 53, Museo Nacional de Antropología e Historia)