"Slack Key Blues” is a tropical slice of Hawaiian culture and American blues that offers a glimpse into Slack Key ‘Ohana’s third album, “Mai Tais in Paradise,” which is expected in late summer. The single is a light and breezy sway on a hammock guided by the soulful voice of Kela Sako, a native Hawaiian and the newest member of Slack Key ‘Ohana. Sako’s exquisite lead vocals surf the guitar groove crafted by Anderson and Brian Witkin and augmented by Carol Witkin’s ukulele.