Fusion! Music that's so exciting but a lot of non-musicians really don't get it. Just like acoustic jazz, this more electric form of jazz is filled with instrumental improvisation, complex rhythms, (then) futuristic sounds plus some extra power, when you speak of muscle cars, fusion is muscle jazz...
I love it. And in the 70's and 80's it must have been fantastic seeing all these great fusion bands, Herbie Hanock, Miles Davis, Weather Report, Brecker Brothers, Steps Ahead, Joe Zawinul..
Straphangin' is the 6th album of these influential brothers, Randy and Michael Brecker. Wikipedia
My personal favourite is Jacknife: