He said nothing about ‘solos’; he was talking about displaying ability to go beyond just plonking root notes like on “House Of The Rising Sun”, or whatever. “2120 S. Michigan”, a deep cut instrumental jam, is driven by that bassline, which may sound simple, but although it ain’t Jaco, there’s some subtle changes within the cycle; it’s not just playing a riff in G, and repeating in C...
It was appropriated by Thee Midnighters for their local hit, “Whittier Blvd”...
For me, “Sunshine...” was a benchmark, although it’s pretty simple, learning that run in “Hey Joe” was a breakthrough for me early on, “Going Up The Country” showed how much stamina you had, but the Stones’ “Live With Me” impressed people.