There are at least two artists using this name:

1) Soley is an electronic artist from West Islip, New York, United States. Soley expresses through practicing sound wave manipulations to create a storytelling ingrained to each song. Humbly hope to encourage listeners to create and manifest their own expressions out into reality inspired by Soley’s sound design.

2) Soley is a music group from Madagascar which plays a variety of genres including sega from Reunion island (see tag 974), reggae, salegy (from Madagascar itself) and biguine.

It may also refer to at least two things:
1) an incorrect tag for Sóley, an Icelandic singer
2) an album by DobaCaracol, a female reggae duo from Quebec

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Artist biography from last.fm