Is Turn It On Again by Genesis written in 6/8 and then 7/8, or 13/16?
neither, i think by any reasonable assessment those are quarter notes. so either 6/4 + 7/4, or 13/4. and as for which, you'd have to ask them but if it were me i'd prefer 6/4 + 7/4 so your bars are a slightly more reasonable size