Motown

google

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1960s: shortening of Motor Town, by association with the car manufacturing industry of Detroit.

wiktionary

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Blend of  motor +‎  town; see  Motor City. The poker slang comes from jacks and fives sounding similar to Jackson 5, associated with Motown popular music. 

etymonline

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Motown

recording label launched 1960 by Berry Gordy Jr., from Mo(tor) Town, perhaps based on Motor City, a nickname for Detroit attested by 1911.