Daniel Blumberg is an English artist, musician, songwriter and composer. He has released music under a variety of names including Hebronix, Oupa, Heb-Hex, Daniel Blumberg and Guo. From 2009-2013, Blumberg was frontman and guitarist for the indie rock band Yuck, with whom he released their debut album. Unreal by Hebronix, produced by Neil Michael Hagerty, was released by ATP Recordings in 2013. This was followed by a split single with Neil Michael Hagerty, released under the name Heb-Hex.
Since 2013 Blumberg has been performing and recording at Cafe Oto. Blumberg performs with Seymour Wright (saxophone) as GUO. Their first release, GUO1, was self-released in 2016, with a text from David Toop. In 2017, GUO2 was released by Cafe Oto's label Oto Roku and included text from American filmmaker Brady Corbet.