From 1961 to 1965, this chart was compiled from the "Billboard" Hot 100 chart by removing songs that were deemed rock and roll by the magazine and re-ranking the remaining songs. ("Record World's" equivalent "non-rock" chart followed the same criteria from 1967 through 1971.) Beginning in 1965, the Easy Listening chart would begin to be compiled by a method similar to the one used for other "Billboard" singles charts: reported playlists from radio stations airing the format as well as sales data submitted by record stores. By the early 1990s, automatic song detection and barcode sales information had begun to be the norm for most of the "Billboard" charts, although by this time the AC chart was based entirely on radio airplay and no longer incorporated retail sales reports. Currently the Hot Adult Contemporary Tracks chart is compiled in much the same way as for other radio formats.