There are at least six artists that have used this name:

1. Juno was an American indie rock band formed in Seattle, WA in 1995. They released their debut album This Is the Way It Goes and Goes and Goes on DeSoto Records on March 30, 1999. Their second album A Future Lived in Past Tense was released May 8, 2001.

Although their two albums are very paced, steady, slow-burning epics with the occasional explosion of fireworks (hear Leave a Clean Camp and a Dead Fire for a quintessential Juno track), live and in person Juno was a ferocious rock-beast bearing little resemblance to their in-studio persona.

The band is now officially defunct. They had played with and auditioned a few different bassists (including Nick Harmer of Death Cab for Cutie), but ultimately decided that they were going in different directions artistically. According to a post made to the Juno web site by lead singer Arlie Carstens in the fall of 2003, the break up was amicable. Currently some of the former members are working on Ghost Wars, which may or may not be a band, but has music on Myspace.

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2. There was also one slovakian folk and one irish folk band called Juno.

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3. Juno is a UG hiphop artist from Finland, he's songs are all about life, not that 'yo I've got women and money'-bullshit. He sings about hes own life and memories, about the things he misses, loves and regrets.
Peace Out!<3

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4. A trance music collaboration between Jörg Pahl & Niels Eckstein. They had three releases in 1994 and 1995.

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5. A techno music collaboration between Alan Payne & Kevin Millington. They only had one release in 1990 on the influential Bassic label, but it was an important release in the Yorkshire Bleeps and Bass scene.
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6. A rock/ambient/acoustic rock band from North Dakota & Minnesota.

7. A pop/alternative artist from the Bay Area, CA

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Also of note: The tracks of the Official Soundtrack for the film "Juno" are often mis-tagged with a Juno artist designation for ease of library browsing.