Answer:Based on your description, you might be referring to a nightingale or a warbler. Both are small songbirds known for their intricate nests and melodious singing. Nightingales are particularly famous for their beautiful, complex songs and are often associated with high trees and serene settings, while certain types of warblers are also known for their sweet singing voices and elaborate nesting habits in tall trees. Another possibility is the American robin, which sings melodiously and also builds intricate nests in trees.