Justin Timberlake will release the second half of songs he wrote over a year ago with Timbaland on September 30. It all happened during a whirlwind month when over 20 songs were worked on within a 30 day period. The 20/20 Experience 2 of 2 will actually feature 11 songs instead of 10 as on the first installment, because Timberlake simply wanted to release more of the music they created. On Friday, the second single from part two, “TKO,” hit iTunes.

“Tim and I went in (to the studio) over a year ago with Rob Knox, Jerome Harmon… a bunch of great producers,” said Timberlake via telephone on “The Ralphie Show” earlier this month. “I just told them, I said, ‘Look, I don’t have any expectations for this music even coming out. Let’s just write a bunch of music and have fun doing it and keep it to ourselves.”

Timberlake teased in an open letter to fans that the album only marks the second of four quarters in the process of his new journey. Outside of the LP, the only other known item on Timberlake’s agenda is his upcoming solo arena concert.