By early 1990, New Kids on the Block had become one of the most popular acts in the United States. The following May, they followed up "Hangin' Tough" with "Step by Step", which featured slightly more than half of the songs co-written and produced by the members themselves. The first single, the title track, raced to number one on the Hot 100 Singles Chart and became their biggest selling single. It was followed up with the top ten "Tonight", which extended the consecutive top ten singles chart run to nine records. "Let's Try It Again" hit No. 8 on the UK Singles Chart, whilst "Baby I Believe In You" went No. 1 on the Japanese Chart, further signifying the international appeal of the group. The album was eventually certified triple platinum, selling close to 20 million copies worldwide.