https://www.musical-u.com/learn/the-shed-the-free-music-theory-resource-for-the-modern-musician/
Years ago, aspiring young jazz musicians living with big families on small rural homesteads resorted to practicing their instruments in the woodshed. Thus, in jazz lingo, The Shed became synonymous with the practice room.
https://www.musical-u.com/learn/the-shed-the-free-music-theory-resource-for-the-modern-musician/