Who was the artist who worked with Max Martin and a Swedish songwriter to make her second greatest hits album?
3 (Britney Spears song): "3" is a song recorded by American singer Britney Spears for her second greatest hits album, "The Singles Collection" (2009). 3 (Britney Spears song):  It was written and produced by Max Martin and Shellback, with additional writing from Tiffany Amber. Shellback (record producer): Karl Johan Schuster (] ; born 1 February 1985), known professionally as Shellback, is a Swedish songwriter, record producer, and musician.
Britney Spears