We found one dictionary that defines the word sing loudly:

Phrases: to sing loudly, more... ▸ Words similar to sing loudly ▸ Usage examples for sing loudly ▸ Idioms related to sing loudly ▸ Wikipedia articles (New!) ▸ Words that often appear near sing loudly ▸ Rhymes of sing loudly ▸ Invented words related to sing loudly