Slaty-backed Nightingale-Thrushes (Catharus fuscater) are heard more than seen in the Monteverde Cloud Forest Preserve (Costa Rica), and they sing one of the area's most pleasing songs.
IIf you get really close to a singing Slaty-backed Nightingale Thrush, the song can lose some of the ethereal quality that it gains from reverberation and natural acoustics. This example was recorded for only a few meters away - you'll see what I mean.