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Texting song lyrics to one another is a practice they’ve had since Nelson, 85, texted Cannon the idea for their 2012 hit, “Roll Me Up and Smoke Me When I Die.”

“I don’t think Willie has ever considered how he writes. He just writes,” Cannon tells CMT.com. “When we’re doing this stuff, it’s without a plan, and sometimes Willie gets fired up to write and starts sending me stuff when he’s been in Maui for about seven or eight days in a two-week stay over there. I guess he starts getting rested up, and his mind starts churning, and he just starts sending me stuff like he’ll send me three or four lines. Sometimes he’ll send me what is pretty much a complete song.”

But for as long as they’ve known one another, Cannon isn’t quite sure when to send Nelson a birthday card.

“It’s either April 29 or 30,” Cannon guesses. “I think officially it’s April 30. But there’s some question. I think he said that his birth certificate says that it was something like 12:15 a.m. on April 30. But I believe he said it was one of his aunts who said he was born just before midnight. He doesn’t know for sure. He just celebrates two days.”

Enjoy a series of photos of Nelson through the years:

1. Willie Nelson signs with RCA Records in 1964

   

   Michael Ochs Archives/Getty Images

2. Willie Nelson at Hotel Taft in 1967

   

   Michael Ochs Archives/Getty Images

3. Willie Nelson live at Los Angeles’ Palomino Club in 1970

   

   Michael Ochs Archives/Getty Images

4. Willie Nelson, Emmylou Harris and Joan Baez in 1974

   

   Richard McCaffrey/ Michael Ochs Archive/ Getty Images

5. Willie Nelson And Waylon Jennings in 1978

   

   Richard E. Aaron/Redferns

6. Willie Nelson live in Chicago in 1978

   

   Paul Natkin/Getty Images

7. Willie Nelson in 1984

   

   Paul Natkin/WireImage

8. Willie Nelson in 1986

   

9. Merle Haggard and Willie Nelson in 1988

   

   Beth Gwinn/Getty Images

10. Willie Nelson, Kris Kristofferson and Jesse Jackson

    

    Ebet Roberts/Redferns)

11. Willie Nelson, Neil Young and Kris Kristofferson

    

    Ebet Roberts/Redferns

12. Neil Young and Willie Nelson in 2003

    

    Paul Natkin/WireImage

13. Willie Nelson and Sheryl Crow rehearse for the Johnny Cash Memorial Tribute: A Celebration Of Friends and Family

    

    R. Diamond/WireImage

14. Willie Nelson at VH1’s Willie Nelson and Friends

    

    Jeff Kravitz/FilmMagic, Inc

    

    Jeff Kravitz/FilmMagic, Inc

15. Waylon Jennings, Willie Nelson and Jay Leno in 1991

    

    NBC/NBCU Photo Bank via Getty Images

16. The Highwaymen in 1992

    

    Rob Verhorst/Redferns

17. Willie Nelson at the 2012 CMT Music Awards

    

    Jeff Kravitz/FilmMagic

    

    Jeff Kravitz/FilmMagic

    

    Jeff Kravitz/FilmMagic

    

    Jason Merritt/Getty Images

18. Willie Nelson at Luck Reunion 2017

    

    Gary Miller/Getty Images

19. Willie Nelson live at Farm Aid 2017

    

    Ebet Roberts/Redferns

20. Willie Nelson at the Luck Reunion 2018 Welcome Dinner

    

    Gary Miller/Getty Images