The beach-loving duo Def Tech put a sunny spin on Japanese reggae. The pair, which formed in the mid-‘00s, creates upbeat music obsessed with summertime pursuits. To that end, Def Tech have dabbled in both throwback surf rock featuring insistent guitar (“Gone Surfin'”) and slower ukulele numbers (“Catch the Wave”). But they're best at getting the party started with bouncy, upbeat pop, busting out swift raps on irresistible hip-hop/dancehall jams like “In Outside” or creating harmony-rich songs featuring tag-team vocals, synthesized strings, and plucked guitar riffs (“High on Life”).