Wave to Earth makes music that often feels designed for a room much smaller than Radio City Music Hall. On Sept. 29, the South Korean band will test the pleasant contradiction of bringing its soft-edged indie sound to one of New York’s grandest stages.

The band’s pieces tour arrives at Radio City at 8:15 p.m., with doors at 7:15. The booking reflects the global reach of a group whose audience has grown through streaming and social platforms far beyond the boundaries traditionally associated with Korean popular music.

Wave to Earth does not fit the maximalist image many American listeners still attach to Korean music exports. Its appeal is understated: guitars with plenty of air around them, jazz-inflected harmony, relaxed rhythm and vocals that tend to settle into a track rather than dominate it.

That sound has an obvious relationship with headphone listening. Small details become part of the atmosphere, and songs can feel less like declarations than environments. Translating that quality to Radio City requires restraint. The temptation in a landmark hall is to make everything bigger. The better strategy may be to let the room lean toward the band.

Radio City’s scale can support that approach because it is a seated theater rather than an anonymous arena bowl. The audience faces a defined stage, and the architecture supplies spectacle before the production adds anything. A band can afford to leave space.

A quiet kind of scale

The concert also illustrates how rapidly the old categories around K-pop have become inadequate. Korean artists now reach American audiences across R&B, hip-hop, electronic music, indie rock and singer-songwriter traditions. The common denominator is geography, not genre.

Wave to Earth’s rise is particularly revealing because it has not depended on the synchronized spectacle associated with idol groups. The band offers something closer to indie cool, and its international audience demonstrates that Korean music’s export infrastructure can carry quietness as effectively as choreography.

For New York, the Radio City date is another sign that streaming-era audiences do not always reveal themselves through traditional American radio or press coverage. An act can seem niche until the room is announced. Then the scale of the following becomes physically visible.

That moment, when an internet audience becomes a line outside a theater, is one of the useful things live music still measures. Streams are numbers. A sold seat is a person who traveled somewhere at a particular hour.

Wave to Earth brings the pieces tour to Radio City Music Hall on Sept. 29 at 8:15 p.m. This is a preview based on announced event information, not a review of a performance.

The venue confirms an 8:15 p.m. start, with doors at 7:15. That slightly unusual start time is worth noting for anyone accustomed to Radio City’s more conventional 8 p.m. curtain.

The band’s rise also complicates the idea that global pop has to become louder as it gets bigger. Wave to Earth’s appeal depends on atmosphere and understatement, qualities that can survive scale if the arrangement leaves them intact. Radio City’s seated layout may be an advantage here, allowing the room to listen rather than forcing every song to compete with arena chatter.

There is no need to turn the booking into a referendum on Korean music abroad. The simpler point is more interesting: a band with a relatively gentle sound has built enough of a New York audience to fill a landmark hall. On Sept. 29, that audience becomes visible.