The file refers to a digital recording of the organ chorale prelude "Da Jesus an dem Kreuze stund" (When Jesus stood by the Cross), composed by Johann Sebastian Bach .
: The .m4v extension indicates it is an Apple-standard video container, often found in older digital archives or uploads like the recording on YouTube by user "Women Of WW2". Historical Significance 621.m4v
: It corresponds to BWV 621 in the Bach-Werke-Verzeichnis (Bach Works Catalogue). The file refers to a digital recording of
