The Alleluia for the Feast of St.Michael yesterday presented some challenges, the first being that there seemed to be no recordings of it available. I was happy to discover through someone on the Musica Sacra forum an awesome resource: www.gregorianbooks.com which offers many recordings of hard-to-find propers so that was a happy benefit of my search.
The Alleluia is of particular note.
I found this section the most challenging with its two climacus of different lengths.