Yellow warbler sings on osprey nest

This video from the USA says about itself:

Male Yellow Warbler Hops Into Hellgate [osprey nest] For a Song – June 25, 2019

Male Yellow Warblers sing a sweet series of 6–10 whistled notes that accelerate over the course of the roughly 1-second song and often end on a rising note. The tone is so sweet that people often remember it with the mnemonic “sweet sweet sweet I’m so sweet.”