B.B. King recorded "The Thrill Is Gone" in June 1969, and the guitar he played on that session did more talking than any instrument in the room. The song, a slow twelve-bar blues in B minor, had been written by Roy Hawkins and Rick Darnell back in 1951. King had known it for years, had carried it around in his head, had even played the Hawkins original on the radio when he was a Memphis DJ in the 1950s. He tried recording it several times and never liked what came back. Then producer Bill Szymczyk got involved, and everything changed.

Szymczyk was a young staff producer at ABC Records in 1969, still building his name. The story of how "The Thrill Is Gone" got its final shape is almost too good: Szymczyk called King at four in the morning and suggested adding strings. King, by his own account, would have agreed to just about anything at that hour. The string arrangement that followed was handled by Bert de Coteaux, and it turned a solid blues track into something that could travel. The polished production marked a deliberate departure from both the Hawkins original and King's own previous work, and it worked exactly as intended.

The studio band on "Completely Well" — the album that housed the track, released December 5, 1969, on BluesWay Records — was a tight unit. Hugh McCracken played guitar alongside King. Paul Harris handled piano, organ, and electric piano. Gerald "Fingers" Jemmott held down the bass. Herbie Lovelle played drums. Szymczyk produced and engineered. These were not King's touring musicians. They were New York session players, and the combination of their precision with King's phrasing gave the record a cleaner, more radio-ready sound than anything King had cut before.

The vibrato is the thing. King's left-hand vibrato was not a conventional guitar technique. He developed it as a young man trying to replicate the sound of slide guitarists like Bukka White and Elmore James, players he admired but could not directly imitate, because he could not do vibrato and slide simultaneously. So he built a substitute: a rapid, horizontal flutter applied to fretted notes by shaking his entire hand. The result was closer to a violinist's vibrato than anything else in electric blues, and it gave every sustained note a vocal quality that no amount of studio polish could manufacture. On "The Thrill Is Gone," that vibrato is the emotional center of the recording. The strings frame it. The rhythm section holds the space open. But the guitar, a Gibson ES-355 King called Lucille, is where the feeling lives.

King famously did not like to sing and play at the same time, so he built his performances around a call-and-response between his voice and Lucille. On "The Thrill Is Gone," that structure is audible in every verse. He sings a line, then the guitar answers it, and the answer is always more specific than the lyric. The vibrato on those responses does not decorate the melody. It extends it, bends it slightly toward grief, and then releases it. The strings, for all their elegance, are the backdrop. The guitar is the argument.

"The Thrill Is Gone" is the closing track on "Completely Well," sitting at position nine after eight tracks that are good but not transformative. Placing it last was either a confident bet or a happy accident, but either way it functions as a destination. By the time the strings come in, the listener has been through enough of the album to feel the shift in register. The song does not announce itself. It arrives.

BluesWay released "The Thrill Is Gone" as a single in December 1969. It peaked at number 15 on the Billboard Hot 100 in 1970 and reached number 3 on the R&B chart. "Completely Well" itself climbed to number 38 on the Billboard 200, making it King's first Top 40 album in the United States. The single earned King the Grammy Award for Best Male R&B Vocal Performance at the 1970 ceremony, his first Grammy, and the recording was later inducted into the Grammy Hall of Fame in 1998. Rolling Stone placed it at number 183 on its list of the 500 Greatest Songs of All Time.

The crossover mattered because it was real. King was forty-three years old when he recorded the track, twenty years into a career that had produced genuine R&B hits but had never broken through to the pop audience. "The Thrill Is Gone" did not simplify him to get there. The strings gave it a surface that pop radio could accept, but the guitar underneath was the same guitar King had been playing in juke joints since the early 1950s. The vibrato that made the record was the same technique he had been developing since he first walked into a Memphis studio in 1949. Nothing was softened. The production just cleared a path.

King died in May 2015 at age 89 in Las Vegas. He left behind fifteen Grammy Awards, a Rock and Roll Hall of Fame induction, and a guitar vocabulary so specific that every blues and rock guitarist who came after him either learned from it or spent years trying to avoid sounding like they had. The vibrato is the hardest part to copy. Players have been trying since 1969, and the consensus is that no one has quite gotten there. That is not a mystical claim. It is a technical one. King reached the note in tune and then added the flutter around the fretted pitch, a sequence that sounds simple and is not. On "The Thrill Is Gone," he does it on nearly every sustained note for five and a half minutes, and it never sounds like a trick. It sounds like the only honest way to play the song.