Ed Sheeran hasn't yet released a Number One single in the U.S. under his own name – "Thinking Out Loud" stalled at Number Two thanks to the unstoppable "Uptown Funk." However, this February a song Sheeran wrote with Justin Bieber, "Love Yourself," ended up topping the charts. In fact, you've been hearing songs that Sheeran wrote for and with other artists for years, whether you've known it or not. Here are 10 of the most noteworthy.