Mumbai, March 27 (IANS) While actress Lara Dutta has opted out of the Bachchans' "Unforgettable Show" world tour because of her knee injury, Akshay Kumar has decided to join it, though he will perform only at select venues.The show's organisers Wizcraft are now in the process of finalising seven to eight big stars from Bollywood to accompany Amitabh and Abhishek Bachchan, and Aishwarya Rai at various venues in July and August.

" Akshay is back in the Bachchans' world tour. But he'll join them only at selected venues because that is all Akshay's schedules allow," said a source.

"Likewise, at other centres we're roping in other A-listers who will join the Bachchans as they perform all over the US and later Europe. In this way there would be a couple of big surprise guest appearances by marquee names in every city, though rightly the focus of interest would remain the Bachchan family," added the source.

Composer duo Vishal-Shekhar has been confirmed as a part of the tour. They will be accompanying the Bachchans for all their concerts, just like decades ago Kalyanji-Anandji used to be an integral part of the Big B's concerts.

In fact, an album featuring Abhishek with guest vocals by the Big B that Vishal-Shekhar have been putting together for the last two years will finally be ready to coincide with the Bachchans' world concert.