On today’s episode of Billboard's Chart Rewind, we look back at the Isley Brothers hitting No. 1 on the Best Selling Rhythm & Blues singles chart, now called Hot R&B / Hip-Hop songs with their song "It's Your Thing." ►► Subscribe for more music news: http://blbrd.cm/Proracf ►► See our latest videos: http://blbrd.cm/xOgw6VQ About: Billboard is the world's most influential music media brand, with an unmatched authority among artists, fans and the industry. Billboard powers the ultimate global