Kings of Harmony +1.

Assuming this is gospel.  Unfortunately, the ACL website provides zero guidance about who this is, and Spotify has multiple groups using this name.  Listed in order as they are shown on Spotify:

• Kings of Harmony of Bristol, PA.  Top Hit: "Jesus Can Do," with less than 1,000 listens.  A laid back jam that sounds like slowed down Jimmie Vaughan.
• Carolina Kings of Harmony.  Top Hit: "I'm Going to Live up in Glory," also less that 1,000 listens.  Old school organ and an echoing baritone.  Classic sound.
• Mighty Kings of Harmony.  Top Hit: "Touch Me Lord," with less than 1,000 listens.  Big pile of dudes making harmony over some synths and drums.
• Original Kings of Harmony.  Top Hit: " So Glad," hey guess what?  Less than 1,000 listens. Kind of an awesome song.  Scratchy million-year-old recording with no instruments, straight scat-n-bop from the backup singers.
• Kings of Harmony.  Only Song on Spotify: "Shine on Me," with, surprisingly, less than 1,000 listens.  The song appears on Time Records' The Greatest Spirituals Volume 2.  Acapella action.
• Kings of Harmony Brass Band.  Only Song on Spotify: a pretty kick ass version of "When the Saints Go Marching In."  I know you won't believe me, but less than 1,000 listens.
• Kings of Harmony Voices.  Top Hit: "My Soul Longs for Peace and Joy," with (shocker!) less than a thousand spins.  More of a straight choral acapella arrangement, less gospel-y.
• Kings of Harmony Quartette.  Top Hit: "Trees Are Bending," with less than 1,000 jams. Another track that sounds a million years old, recorded off of a scratchy record, and reminds me of O' Brother Where Art Thou?
• Lopez & Hamilton's Kings of Harmony Orchestra.  Top Hit: "Afganastan" (yes, literally spelled that way).  Finger wagging prohibition-era dance music.
• Rizzy Kings of Harmony.  Only Song on Spotify: "Come on and Party."  Less than 1,000 listens, and in a break from the others in this list, this is a dance tune, like a 2015-released beat made to jam out to with your best friends at Cancun.  Weird.

So, turning to YouTube, I think I found it.  You are supposed to call them "Kings of Harmony Plus One."  If you are prone to vomiting if you watch video shot by someone with the shakes, do not watch this video.

Nice.  585 views.  They might rethink the band name so that its no so confusing when they blow up, but I'm sure they'll rock out the Sunday morning crowd in October.  Hella cool overalls.  In case you are hungry for more:

318 views.  They broke out the suits for that one.