Electric guitar wizard Sekou Diabate opts for an acoustic feel on Guitar Fö (Discorama/Harmonia Mundi).  Playing with emotion instead of obvious flash, this senior citizen of pickin’ achieves a laid-back ambience with oodles of intensity just beneath the surface somewhat like the style of Hawaiian slack key masters.  In his twilight years, comedian George Burns once said he owed his long success to a practice of never performing material that was younger than he was.  Diabate, who co-founded Guinea’s Bembeya Jazz in the 1970s, follows suit by treating us to a repertoire of classic rumba-flavored songs from the heyday of African pop, some which have become standards with his band.  The Bembeya Jazz showstopper “Diamond Fingers” gives him a chance to strut his stuff, while “Dianam” with its lovely vocal harmonies vastly improves upon the somewhat bumpy version last heard on Bembeya Jazz’s 2003 disc Bembeya.  But for one of the best examples of Diamond Fingers at his most lustrous, check out “Dabia Baba” with its impressive string stutters and heartfelt grace.