<Table> Key <Tr> <Td> </Td> <Td> Indicates best - performing single of 2015 </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Indicates best - performing single of 2015 </Td> </Tr> <Table> <Tr> <Th> Issue date </Th> <Th> Song </Th> <Th> Artist (s) </Th> <Th> Ref . </Th> </Tr> <Tr> <Th> January 3 </Th> <Td> "Blank Space" </Td> <Td> Taylor Swift </Td> <Td> </Td> </Tr> <Tr> <Th> January 10 </Th> <Td> </Td> </Tr> <Tr> <Th> January 17 </Th> <Td> "Uptown Funk!" </Td> <Td> Mark Ronson featuring Bruno Mars </Td> <Td> </Td> </Tr> <Tr> <Th> January 24 </Th> <Td> </Td> </Tr> <Tr> <Th> January 31 </Th> <Td> </Td> </Tr> <Tr> <Th> February 7 </Th> <Td> </Td> </Tr> <Tr> <Th> February 14 </Th> <Td> </Td> </Tr> <Tr> <Th> February 21 </Th> <Td> </Td> </Tr> <Tr> <Th> February 28 </Th> <Td> </Td> </Tr> <Tr> <Th> March 7 </Th> <Td> </Td> </Tr> <Tr> <Th> March 14 </Th> <Td> </Td> </Tr> <Tr> <Th> March 21 </Th> <Td> </Td> </Tr> <Tr> <Th> March 28 </Th> <Td> </Td> </Tr> <Tr> <Th> April 4 </Th> <Td> </Td> </Tr> <Tr> <Th> April 11 </Th> <Td> </Td> </Tr> <Tr> <Th> April 18 </Th> <Td> </Td> </Tr> <Tr> <Th> April 25 </Th> <Td> "See You Again" </Td> <Td> Wiz Khalifa featuring Charlie Puth </Td> <Td> </Td> </Tr> <Tr> <Th> May 2 </Th> <Td> </Td> </Tr> <Tr> <Th> May 9 </Th> <Td> </Td> </Tr> <Tr> <Th> May 16 </Th> <Td> </Td> </Tr> <Tr> <Th> May 23 </Th> <Td> </Td> </Tr> <Tr> <Th> May 30 </Th> <Td> </Td> </Tr> <Tr> <Th> June 6 </Th> <Td> "Bad Blood" </Td> <Td> Taylor Swift featuring Kendrick Lamar </Td> <Td> </Td> </Tr> <Tr> <Th> June 13 </Th> <Td> "See You Again" </Td> <Td> Wiz Khalifa featuring Charlie Puth </Td> <Td> </Td> </Tr> <Tr> <Th> June 20 </Th> <Td> </Td> </Tr> <Tr> <Th> June 27 </Th> <Td> </Td> </Tr> <Tr> <Th> July 4 </Th> <Td> </Td> </Tr> <Tr> <Th> July 11 </Th> <Td> </Td> </Tr> <Tr> <Th> July 18 </Th> <Td> </Td> </Tr> <Tr> <Th> July 25 </Th> <Td> "Cheerleader" </Td> <Td> Omi </Td> <Td> </Td> </Tr> <Tr> <Th> August 1 </Th> <Td> </Td> </Tr> <Tr> <Th> August 8 </Th> <Td> </Td> </Tr> <Tr> <Th> August 15 </Th> <Td> </Td> </Tr> <Tr> <Th> August 22 </Th> <Td> "Can't Feel My Face" </Td> <Td> The Weeknd </Td> <Td> </Td> </Tr> <Tr> <Th> August 29 </Th> <Td> "Cheerleader" </Td> <Td> Omi </Td> <Td> </Td> </Tr> <Tr> <Th> September 5 </Th> <Td> </Td> </Tr> <Tr> <Th> September 12 </Th> <Td> "Can't Feel My Face" </Td> <Td> The Weeknd </Td> <Td> </Td> </Tr> <Tr> <Th> September 19 </Th> <Td> "What Do You Mean?" </Td> <Td> Justin Bieber </Td> <Td> </Td> </Tr> <Tr> <Th> September 26 </Th> <Td> "Can't Feel My Face" </Td> <Td> The Weeknd </Td> <Td> </Td> </Tr> <Tr> <Th> October 3 </Th> <Td> "The Hills" </Td> <Td> </Td> </Tr> <Tr> <Th> October 10 </Th> <Td> </Td> </Tr> <Tr> <Th> October 17 </Th> <Td> </Td> </Tr> <Tr> <Th> October 24 </Th> <Td> </Td> </Tr> <Tr> <Th> October 31 </Th> <Td> </Td> </Tr> <Tr> <Th> November 7 </Th> <Td> </Td> </Tr> <Tr> <Th> November 14 </Th> <Td> "Hello" </Td> <Td> Adele </Td> <Td> </Td> </Tr> <Tr> <Th> November 21 </Th> <Td> </Td> </Tr> <Tr> <Th> November 28 </Th> <Td> </Td> </Tr> <Tr> <Th> December 5 </Th> <Td> </Td> </Tr> <Tr> <Th> December 12 </Th> <Td> </Td> </Tr> <Tr> <Th> December 19 </Th> <Td> </Td> </Tr> <Tr> <Th> December 26 </Th> <Td> </Td> </Tr> </Table> <Tr> <Th> Issue date </Th> <Th> Song </Th> <Th> Artist (s) </Th> <Th> Ref . </Th> </Tr>

What was the number one song in may 2015
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