What is asongbird of the Old world tropics with a glossy black plumage and forked tail?

The songbird you are referring to is likely the Asian Paradise Flycatcher (Terpsichore paradisi). This bird is known for its striking glossy black plumage and long, forked tail, which makes it easily recognizable in its tropical habitat. Found in various regions across Asia, it is celebrated for its melodious song and vibrant appearance, particularly in males. The species is often seen in forests and gardens, where it forages for insects.