Bobby McFerrin`s single ''Don`t Worry, Be Happy,'' has leaped to No. 1 on Billboard`s pop singles chart, displacing ''Sweet Child o` Mine,'' by Guns `n` Roses, the heavy-metal band whose album ''Appetite for Destruction'' tops the pop album chart.
`n` Roses and Def Leppard hold down the top two positions on the chart, the next five positions are occupied by Tracy Chapman, D.J. Jazzy Jeff and the French Prince, Steve Winwood and George Michael, each of whom represents a different style and constituency.
McFerrin`s hit is earning the superb vocal improviser a mass audience, as his album, ''Simple Pleasures'' leaps from No. 20 to No. 12 on the album chart.