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I debated whether this might be a Spotted SP instead of a Solitary SP but after creating spectrograms of both species calls (using Stokes Birdsong CD as a source), I lean towards the Solitary. Spotted SP calls seem to start around 3.5 kHz whereas Solitary SP start around 3.9 - 4.2 kHz.

martinap2@verizon.net

             Solitary Sandpiper recorded on 5/16/06 around 2:35 AM

        Solitary Sandpipers recorded on night of 5/13-14, time unknown