Ah ha, let me tell you my fine English friend that graduation rituals of the Americans, are very difficult to fathom...even I, an American, often have to ask what on earth is this or that..
However, we generally have a processional type song, the classic being, "pomp and circumstance"...very dignified, I've played it about fifty thousand times in my life, as I was in the band...and you must play it a million times...until all the grads have thrown their tassles over the opposite sides of their mortarboards. Are you quite following this?
The rhythm is da da da da da daaaaa da....repeated over and over.
Sometimes there is a song sung at a ceremony...I myself played the solo "Laura" at my own ceremony, as it was a smaller one, rather than the big event of about 500 people minimum at my enormous country school.
Perhaps they now have a more modern song, is that it?
When I taught in several places in America and several types of schools, we had to officiate and wear our gowns and hats...(bring the bobby pins!) and I cannot remember any particular song being sung...
Perhaps our original poster will have to tell us what he or she means though.
How is it chosen nowadays?
I think they probalby had the Carpenters' "we've only just begun" at my year's big ceremony.
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I was born under a wandering star.