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Sonogram of Swainson's Thrush, followed by a Gray-cheeked Thrush and a few seconds later, a good candidate NFC for a Bicknell's Thrush over my house on 5-21-10. Initially, I thought both calls may be from a Bicknell's Thrush but recent discussion on the NFC-L list clarifies that Gray-cheeked calls can top out in mid 4 KHz's and are not necessarily indicative of a Bicknell's. Refer to the 9-19 and 9-20-11 discussion at For even more in-depth info see Evans, W. R. 1994. Nocturnal flight call of Bicknell’s Thrush. Wilson Bull. 106:55-61 at Bill Evans Old Bird website:

Bicknell's Thrush (3rd call on right) recorded on 05-21-10 at 3:41 AM

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Closerview of presumed Bicknell's Thrush call - no sound linked to this sonogram