In an unprecedented online version of MIT’s annual Commencement exercises, necessitated by the departure of most people from the campus because of the Covid-19 pandemic, the Institute added some innovative touches — including a surprise appearance from the International Space Station — to the unusual but festive occasion. The online ceremony opened with a rousing musical performance by the MIT Wind Ensemble. Recorded individually and edited together, the musicians played “To The Light, To The Flame,” by composer Jamshied Sharifi ’83, which had its world premiere at MIT a few…