Just Blaze spent some time on Twitter over the long weekend answering fan questions about some of his biggest hits. One of the more interesting stories he told is about Kanye West’s “Touch The Sky,” off of his 2005 album Late Registration.

“Touch The Sky” is the only song on the album that didn’t feature additional production from Kanye. He explained that production for the track was made just before ‘Ye met him at Baseline Studios:

Just also revealed that he personally called Robert Glasper to play piano on the outro to “Touch The Sky.” Last year, Glasper revealed that he contributed to the song on Twitter. Fans never heard the Glasper version until Just stopped by Beats 1’s Abstract Radio show late last year and played it.

“I originally had the idea of ending this record with a piano solo,” he said. “Me and Questlove found a young dude by the name of Robert Glasper and we had him come to Baseline. He put some keys down, now homie’s winning Grammys left and right.” You can hear the unreleased version played around the 1:24:00 mark:

Other stories include how Juelz Santana originally wanted “I Really Mean It” before it went to Cam'ron and that Aaliyah was on her way to record a “More Than a Woman” remix with Just and Freeway at the time of her death. Plus, he shared the history behind Jay Z’s “Hovi Baby,” how Jay’s verse on “Oh Boy” is still floating around somewhere and that Dame Dash almost took Memphis Bleek off Cam'ron’s “The ROC (Just Fire).” Check out more of Just Blaze’s Twitter Q&A right here and head over to read some of his verified annotations on Genius, too.