who composed the songs for this movie?
Pritam, Anupam Amod
Once Upon ay Time in Mumbai Dobaara!
The soundtrack of "Once Upon Time in Mumbai Dobaara!" features five songs, with three of them were composed by Pritam, and two of them by Anupam Amod. 
once upon a time in mumbaai dobara box office collection koimoi UNANSWERABLE
wiki:24190059
Once Upon ay Time in Mumbai Dobaara! [SEP] Soundtrack
The soundtrack of "Once Upon Time in Mumbai Dobaara!" features five songs, with three of them were composed by Pritam, and two of them by Anupam Amod. The latter also recreated the song "Tayyab Ali" which is originally composed by Laxmikant-Pyarelal and written by Anand Bakshi, from the 1977 film "Amar Akbar Anthony". The lyrics for all the songs were penned by Rajat Arora, including the recreated version of "Tayyab Ali". The first single "Ye Tune Kya Kiya", sung by Javed Bashir and composed by Pritam, was released on 13 June 2013, as the lead single from the soundtrack album.