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Tori Kelly, “Tori” The sounds of late-’70s Doobie Brothers and early-’00s “TRL” were both in the air this year — but possibly together only here.

Do you see a parallel between Chicago and the Doobie Brothers or Fleetwood Mac — one of these bands where there’s like a regime change at some point that pretty significantly alters the band’s sound?

The bill features Journey and the Doobie Brothers.

The book is titled after McDonald’s chart-topping 1978 hit with the Doobie Brothers; it covers his childhood in St. Louis and his eventual move to Los Angeles, his stints in Steely Dan and the Doobies, his eventual solo career and his struggles with drugs and booze.

On Wednesday night the two will appear together in a conversation at the El Rey Theatre; McDonald then will spend the summer on the road with the Doobie Brothers, including a June 23 stop at Inglewood’s Kia Forum.