The guitar "skanks" on the second and fourth beat of the bar began to be replaced by a strumming pattern similar to mento and the so-called double chop that can be heard so audibly in the introduction of Bob Marley's "Stir It Up" was developed during this time. More emphasis was put on the groove of the music, and there was a growing trend of recording a "version" on the B-side of a single. The mass popularity of instrumental music in the ska and rocksteady eras continued in reggae, producing some of the most memorable recordings of the early reggae era. Cover versions of Motown, Stax and Atlantic Records soul songs remained popular in early reggae, often helping Jamaican artists gain a foothold in foreign markets such as the UK.