Here a few of my favorite singers performing live.
Mukesh – also playing the harmonium along. – Ek din bit jayaga
Kishore Kumar – Kil the hai gul yahan
Mohammed Rafi – singing Madhuban Main Radhika
Sonu Nigam – singing tribute to Kishore Kumar and Rajesh Khanna
Rajkumar singing Belli Mooditho
PB Srinivas singing in his 80s – see at 10:30 and later; relating his singing experiences 30-40 years back!