Generally, Italo-Disco consists of English pop vocals (often sung a little weirdly by non-native English speakers) over mid-tempo, heavily synthetic disco or hybrid disco-electro rhythms, with emphasized lead synths. It was mostly produced by Italians in the mid-1980s. This style/scene is said to have been named by ZYX Records boss Bernhard Mikulski to market licensed releases and numerous compilations, although not always strictly Italian productions. Thus, the term is sometimes used more broadly to describe dance music from outside of Italy and from different eras and in more diverse styles. On Discogs, fans of the style generally prefer to limit the term's use to 1980s Italian productions and newer material that is clearly a tribute to the original sound, although there are no clear boundaries.