Eastern towhee and spotted towhee
Chapter 6: Song Learning Often Creates Complex Songs and Large Repertoires
Subchapter: How a repertoire is delivered
From page 94 in the book.
Eastern towhee Photo by Wil Hershberger
Spotted towhee Photo by Brian E. Small
♫420. Eastern towhee: During routine daytime singing, an eastern delivers several to many renditions of one song type before switching to another. May 22, 2010. Tye River Gap, Blue Ridge Parkway, Virginia. (1:37)
♫421. Eastern towhee: How he dazzles at dawn, often alternating two or even three different songs, with partial songs and call notes mixed in. June 1, 2010. Mammoth Cave National Park, Kentucky. (6:31)
♫422. Spotted towhee: Note that this recording and the next are recorded before sunrise but late in the singing season, so the intensity of the dawn chorus has passed. 5:04 to 5:22 a.m. Sunrise at 5:31 a.m. June 1, 2018. William L. Finley National Wildlife Refuge, Corvallis, Oregon. (17:44)
♫423. Spotted towhee: 4:55 to 5:21 a.m. Sunrise at 5:31 a.m. June 2, 2018. William L. Finley National Wildlife Refuge, Corvallis, Oregon. (25:55)
♫424. Spotted towhee: More intense dawn singing. Here's his singing pattern for each of the four minutes:
Minute 1: zhree calls, then A A A A A A B A B B
Minute 2: B B B B B B B A B A B A B
Minute 3: A B B A B A B B A B A B A
Minute 4: C C C C C C C C C C C
4:50 to 4:54 a.m. Sunrise at 5:37 a.m. May 23, 2009. William L. Finley National Wildlife Refuge, Corvallis, Oregon. (4:06)