Richard Laing, Sub Pop’s director of sales, sees the partnership with Drip.fm as a way to capture some of the same intense brand loyalty the label engendered in the CD-and-cassette era of the early 1990s.

“Instead of people seeking out recommendations from any kind of algorithm, they’re seeking that out from our label and what we’re looking to put out,” he said.

With their limited musical offerings, Drip.fm and its ilk are niche products unlikely to appeal to a wide audience. But they are giving indie labels a chance to cultivate and monetize their most loyal fans amid the growing number of streaming services. And the ability to sell their music has become an increasing challenge. Digital downloads declined nearly 12 percent in the first half of this year compared with the first half of 2013.

“That’s what labels like ours were built on,” Mr. Laing said. “People bought Sub Pop records and hopefully still do based on seeing the label. So hopefully this is a digital equivalent of that.”