Really old school here, late 60's and most of 70's. EWF, Doobies, Sly and Family Stone, Beatles, Commodores, Four Tops, Chicago, BeeGees, Jackson 5 when they came on the scene, tons more from that period.
From the current period, can't say I have a favorite, unfortunately. Hard for me since not much stands out after having lived through an incredible period of music. There are many good groups out now, but nothing that can compare, probably because of my age.