Premise: "Hello Again" is a song performed by the rock band The Cars, released in 1984 as the fourth single from the album "Heartbeat City". It was the fourth Top 20 hit from the album, reaching number 20 on the "Billboard" Hot 100 chart; it also reached number 8 on the Dance Music/Club Play Singles chart and number 22 on the Mainstream Rock chart.
Hypothesis: 22 songs were more popular than "Hello Again" on the Mainstream Rock chart.