This is the description with the video on YouTube:
Young@Heart sing 'Fix You' by Coldplay.
This is from a documentary shown on Channel 4 in the UK called 'Young@Heart'; the name of the New England octogenarian chorus line. The performer here is Fred Knittle, who suffers from congestive heart failure. This song was intended to be a duet between Fred and another chorus member, Bob Salvini. Sadly, Bob died of a heart attack and it was left to Fred to carry the song on his own. If I'm correct, the people you see crying at 01:13 are Bob's family. The lady you occasionally see mouthing the lyrics in the audience is Fred's wife.
There were some very touching scenes where we see Fred rehearsing alone soon after Bob's death. It was an incredible film.
The current performers in Young@Heart range in age from 71 to 93. Here is more information on the Young@Heart chorus.
Here is Coldplay's version of Fix You. I think I actually like the Young@Heart version better.