THE king is not dead. Not the king of reggae, at least. On Nov. 22, “Africa Unite,” a compilation of Bob Marley’s greatest hits and two never-before-heard songs will be released in Costa Rica by Universal Music.“The story of this is very interesting, because in life Bob Marley, the king of reggae, never had a number-one hit,” said Denis Solera, in charge of public relations for Universal Music Centroamérica. “And now it’s very probable that Bob Marley could have that number-one hit 24 years after his death.” The song that may mark that milestone for Marley is one of the never released tracks, “Slogans,” featuring the music of legendary guitarist Eric Clapton.The two new songs came from a demo tape recorded by Marley in Miami in 1979, which was discovered less than a year ago by his two sons Ziggy and Stephen. The two then contacted Clapton, whose 1975 cover of the Marley classic “I Shot the Sheriff” was a number-one hit, to add more guitar and remaster the original recording. Also featuring classic Marley songs such as “Jammin’,” “Is This Love,” and “No Woman, No Cry,” the album will be available for sale at music stores throughout Costa Rica as of Nov. 22.