While not everyone will agree with this practice, the rock bands below owe some of their greatest hits to outsiders.

Roberta Flack, the chart-topping, Grammy-winning singer-songwriter whose string of hits bridged sophisticated ... with weeks at No. 1 earning the greatest value and weeks at lower spots earning ...

the emergence of subgenres such as New Jack Swing and neo soul and classic songs being crafted by producers and songwriters such as Babyface, Timbaland, Jermaine Dupri and Jimmy Jam and Terry ...