Kendrick Lamar’s How Much a Dollar Cost named best track of 2015 – by Barack Obama

As the end-of-year polls roll in, the White House has joined in the act, with the president and first lady naming their favourite tracks of the year. In an interview with the US magazine People, Barack Obama said his No 1 of 2015 was How Much a Dollar Cost by Kendrick Lamar, from his acclaimed hit album To Pimp a Butterfly.