India, May 18 -- The Delhi Metro was recently seen trending on Twitterverse for setting a different sort of 'track' record.

It had to do with a sound track.

A Metro compartment virtually transformed into a karaoke lounge.

Blame it, or credit it, on a trio of geriatric gentry who decided to dish out their singing skills for fellow commuters.

The three spirited, silver-haired senior citizens took the Metro's Yellow Line commuters by surprise when they pulled out a karaoke mic, much in the manner of jugglers tossing tricks out of their hats.

The spiritedness of their amateur performance quite rivalled that of an 'Indian Idol' or 'India's Got Talent' audition.

Flowing forth from rather rusty, but gusto-loaded geriatric vocal cords was a...