Song class 1
pitch falling at beginning, rising later


Video: https://www.youtube.com/watch?v=wrTFkjWSNEc&t=57s
Song class 2
Song type 3
Pitch rises and then falls

Video: https://www.youtube.com/watch?v=Y49Fh10_YmQ
Video: https://www.youtube.com/watch?v=Blm_OVGs0js
Song type 4
Down-slurred note followed by up-slurred note of similar pitch


Video: https://www.youtube.com/watch?v=msEblPBENeQ
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References:
Song classification from Borror, D.J 1956. Variation in Carolina Wren songs. Auk no. 73:211-229