Possible Clues:

• 'Shape of You' Grammy winner
• "Shape of You" Grammy winner
• "Thinking Out Loud" singer
• Singer seen and heard performing
• Singer whose 'Thinking Out Loud' won the 2015 Grammy for Song of the Year
• I just found out his No. 1 album 'x' is supposed to be read as 'multiple.' Talk about thinking out loud!!!!