This week Derek Jewell looks at the lighter, summery side of popular music - the dancing-lazing-outdoor aspect of interesting sounds. The music comes from three new albums: WEATHER REPORT'S Black Market; the CARPENTERS' Kind of a Hush; and MCCOY TYNER'S Flu with the Wind, the pianist's latest experiments with strings. Plus coolest summer sound of all: the BEACH Boys revived: records