This evolved out of a practice riff the band used to tune Jim Lea's violin before shows. According to Noddy Holder, it took just 20 minutes to write. They layered some chords over the distinctive riff, then ad-libbed some lyrics. When they played it to manager/producer Chas Chandler the following morning, he booked a studio immediately.
Jim Lea recalled to Classic Rock
magazine: "Our first hit, Get Down And Get With It
,' was a cover. Chas kept ringing up saying we needed a follow up, fast. We'd started trying to write in pairs – Don [Powell] and I, Noddy and Dave [Hill] , but the other two weren't coming up with anything. Bolan was big at the time and all his songs were slinky and sexy. That seemed to be what it took to get a hit, so I had an idea to do something softer. At the time Nod and I used to jam along to ['30s French jazz violinist] Stéphane Grappelli and [Belgian jazz guitarist] Django Reinhardt, so I went over to his folks' house to work something up with him. I'd already got the structure and 20 minutes later we had 'Coz I Luv You.' It romped to #1. I had to turn round to Don and say, 'Look, we're going to have to keep this going.'"