Louis Armstrong - When The Saints Go Marching In

I really had a hard time identifying IAC-PAC and HC-PAC cadences in the songs I usually listen to and my favorites. So I decided to chooses one of the classics: "When the Saints Go Marching In" by the great Satchimo himself, Louis Armstrong https://www.youtube.com/watch?v=wyLjbMBpGDA.

Originally, I set out to choose a tune from another trumpet player named Don Ellis, however, if any of you have every listened to Ellis' music, you would understand he and his band play some very unconventional and just simply wacky music with obscure time signatures. So with that, I decided to choose a song with a standard meter and with a simpler melody so I wouldn't be stressing out and pulling the hair out of my head just trying figure out phrases and cadences. 

After actively listening to "When the Saints Go Marching In", I was able to conclude that the song was comprised of a HC-PAC cadence. The first eight measures of the tune (0:16-0:31) made up the half cadence. The first phrase ends on a half cadence because it ends on "re" (C). I also know this because the song is written in the key of B flat major. C is the second note of the school, meaning it is equivalent to "re" in solfege, therefore the phrase ends in a half cadence. As for the next eight bars (0:31-0:45), it was clearly a perfect authentic cadence since the final not landed on "do" (B flat). Since both melodies were basically played the same throughout, despite a couple variations in the second melody (a, a'), the two musical phrases added up to equal a parallel interrupted period.

Since I already knew the key in which the piece was written in, it wasn't too difficult to figure out the tonic and dominant chords. The tonic chord is constructed with the 1st, 3rd, and 5th notes of the scale, making this tonic chord B flat, D, and F. The dominant chord is made with the 5th, 7th, and 9th, making this dominant chord F, A, and C.