Chris Tenney recorded one of the Swainson's thrush songs near Carmel River, the hermit thrush in the northern Sierra Nevada, and the California thrasher in Pinnacles, NM [!]. The second Swainson's thrush song can be found on the CD collection Bird Songs of California produced by the Cornell Laboratory of Ornithology. I slowed both Swainson's thrush songs using Bias Peak 4.