what makes the sound of a heart beat
Heart sounds In healthy adults, there are two normal heart sounds, often described as a lub and a dub (or dup), that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves and semilunar valves, respectively. In addition to these normal sounds, a variety of other sounds may be present including heart murmurs, adventitious sounds, and gallop rhythms S3 and S4.
The Last Beat of My Heart The song is a ballad with strings and accordion. Sioux's vocals addressed a lover who is leaving a relationship, as she asked for him to return to her. She declared her desire to be "close to you til the last beat of my heart".