Bieber stages concert for families of 9/11 victimsNew York, Sep 12 (AZINS) Singer Justin Bieber played an acoustic show for those who lost their loved ones in the 9/11 attacks, as well as for children from the Make-A-Wish foundation.

Bieber appeared on the “Today” show on Thursday as the last guest on its Toyota Summer concert series this year. He performed for a huge number of fans, packing the Rockefeller Center here.

Later while backstage, Bieber played acoustic versions of his songs like "What do you mean" and "All that matters" with guitarist Dan Kanter backing him for the special guests, reports aceshowbiz.com.

Earlier on Thursday, Bieber played some of his biggest hits including older songs like "Boyfriend" and "Baby" while taking the main stage of the "Today" show.