Everyone has mentioned chart busters from the 90s. I'll mention some of the later chart buster songs.
Akshay - Teri Mitti, Shaitaan Ka Saala
Salman - Swag Se Swagat, Munni Badnaam Hui
SRK - Gerua
Hrithik - Ghungroo
Ajay - Mere Rashke Qamar
Aamir - (not known for chart buster music over the last few years) Last I remember, Malang
Of course some of these songs aren't as big as the 90s and the early 2000s.