Task: Question Answering
Input (English): Passage: According to Rolling Stone, Marquee Moon is a post-punk album, while Jason Heller from The A.V. Club described it as "elegantly jagged" art punk. Robert Christgau regarded it as more of a rock record because of Television's formal and technical abilities as musicians: "It wasn't punk. Its intensity wasn't manic; it didn't come in spurts." Both sides of the album begin with three shorter, hook-driven songs, which Stylus Magazine's Evan Chakroff said veer between progressive rock and post-punk styles. The title track and "Torn Curtain" are longer and more jam-oriented. "As peculiar as it sounds, I've always thought that we were a pop band", Verlaine later told Select. "You know, I always thought Marquee Moon was a bunch of cool singles. And then I'd realise, Christ, [the title track] is ten minutes long. With two guitar solos." As Tom Moon observed, Verlaine's singing avoids the "cursory punk snarl" while the band's music demonstrates "extended instrumental sections, impenetrable moods" (as on "Torn Curtain") and historical rock influences like Chuck Berry and the early music of the Rolling Stones (as on "Friction").Verlaine and Lloyd's guitar parts on the album are interplayed around the rhythm section's drum hits and basslines. Their dual playing draws on 1960s rock and avant-garde jazz styles, abandoning the layered power chords of contemporary punk rock in favor of melodic lines and counter-melodies. Verlaine's guitar establishes the song's rhythmic phrase, against which Lloyd is heard playing dissonant melodies. Lloyd had learned to notate his solos by the time they recorded Marquee Moon, allowing him to develop his solo for a song from introduction to variation and resolution. Some songs have the two guitarists trading rhythmic and melodic lines several times while producing tension. "There weren't many bands where the two guitars played rhythm and melody back and forth, like a jigsaw puzzle", Lloyd said.Most of the solos on Marquee Moon follow a pattern wherein Verlaine runs up a major scale but regresses slightly after each step. On "See No Evil", he solos through a full octave before playing a blues-influenced riff, and on the title track, he is heard playing in a Mixolydian mode and lowering the seventh by half a step. "Friction" opens with Lloyd playing octaves before Verlaine's ringing harmonics and series of descending scales. 
Question: What two things do some songs have two guitars trading back and forth like a jigsaw puzzle?
Output (English): rhythm.