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Further to the singing Marsh Wren.
Dave Leatherman posits that an immature might practice in the fall. If so, this guy sure practiced non-stop!
Scott Somershoe's reference explained singing in White-crowned Sparrows (which we often hear in the fall) and Song Sparrows (not so often, and not so representative of spring songs, it seems to me).
And, of course, Townsend's Solitaires set up winter territories around productive Rocky Mtn. Junipers. We hear them on the hillside above our house starting in late September and continuing into spring. The singing tapers off as winter progresses, but the whistle continues non-stop all winter long. The solitaires persevere, at least until a flock of robins comes along and strips the juniper bare.