Yale’s 1905 commencement ceremonies included a honorary doctorate for British composer Edward Elgar, and a portion of his first “Pomp and Circumstance” march. It’s been a staple of graduation processions ever since. The full suite of five marches that Elgar finished takes about 30 minutes to play, but took nearly three decades to complete. The first march has long been in the US public domain; the last, published in 1930, joins it there in two days. #PublicDomainDayCountdown