Wiktionary
vb. (en-simple pastsing along)
Usage examples of "sang along".
Guillermo had records, and he sang along with them, and at work on the road crew he'd join in with any man's song and harmonize with it or sing an obbligato high above the melody, a soaring tenor that took the roof off his head and filled the clouds.
I only listened to her playing the Appassionata, and sometimes I sang along with her in my dreams.
She sang along with grizzled old serving men and anxious young wives, with serving girls and soldiers, cooks and falconers, knights and knaves, squires and spit boys and nursing mothers.
In the music room, where the choir was rehearsing 'How Lovely Are Thy Dwellings', she leapt up on the stage and sang along for a page or two, before telling the cringing music master he looked just like Paul Newman.
The whole audience knew the song, and people sang along on the chorus.