Merriam-Webster's Collegiate® Dictionary, 11th Edition
SING
I. verb (sang or sung; sung; singing)
Etymology: Middle English, from Old English singan; akin to Old High German singan to sing, Greek omphē voice Date: before 12th century intransitive verb
1. to produce musical tones by means of the voice, to utter words in musical tones and with musical inflections and modulations, to deliver songs as a trained or professional singer, to make a shrill whining or whistling sound,
3. to relate or celebrate something in verse, to compose poetry, to create in or through words a feeling or sense of song , to produce musical or harmonious sounds , buzz , ring , to make a cry ; call , to give information or evidence, transitive verb to utter with musical inflections, to relate or celebrate in verse, chant , intone , to bring or accompany to a place or state by singing , singable adjective
II. noun
Date: 1850
a session of group singing