There are several artists/groups with this name.

1) Hello was a Bell Records label, teen appeal glam rock band, based in England.

They were formed in 1971, originally being called The Age. Their biggest success came in the UK and Germany in the mid 1970s.

Their Top 10 hits in the UK Singles Chart were "Tell Him" (a cover of The Exciters 1963 hit) and "New York Groove", the latter of which was written by Argent band member Russ Ballard. "New York Groove" was later covered to provide a solo Billboard Hot 100 chart hit in the U.S., for the rock guitarist Ace Frehley of the rock band KISS.

By 1979, with no recording contract, the band split up, with former guitarist Keith Marshall releasing a solo effort, "Only Crying", in 1981. It found a place in record charts worldwide.

According to the band's official website, in 2002 original lead singer and rhythm guitarist Bob Bradbury reformed the band with him as the sole remaining original member.

2) Hello is also an experimental project by Shinjiro Yamaguchi (guitar) & Takahiro Kawaguchi (tuning fork). They released an untitled album on Improvised Music from Japan sublabel Ftarri in 2009. Another long untitled piece was featured on the 'Ftarri Collection' 7-CD compilation released in December 2013.

3) Hello is a music group from Yogyakarta, Indonesia. Build on December 17 2007 by its 5 members (Widi - vocal, Gavet - keyboard, Gani - guitar, Prima - bass, and Dedy - drum), this band has produced 2 albums in 2008 (Say Hello) and 2011 (Kepala Batu).

On 2012, they also produced a single named "Move On".