There are at least two bands named 5ive.

5ive are an instrumental band from Boston, MA formed in 2000 consisting of the duo of Ben Carr and Charlie Harrold.

In 2001, 5ive released their self titled first studio album on Tortuga Recordings, which included Jeff Caxide (Isis) on bass. Later in the same year, they released their second studio album, The Telestic Disfracture, which included vocals on the first two tracks by Jonah Jenkins (Milligram). In 2003, the band changed their name to 5ive's Continuum Research Project and released, The Hemophiliac Dream (EP) which again included Jeff Caxide (Isis) on bass. In 2004, they released a Split with Kid606. In 2006, they changed their name back to 5ive and released Versus, which originally was a tour only EP from 2004, which included a two stage remix of the track Soma, the latter being remixed by Justin Broadrick (Godflesh, Jesu). In 2008, they released their third studio album, Hesperus.

5ive mixes space rock, post-metal, experimental and sludge elements that make their sound vast and infinite. Ben Carr in an interview with Carl Shultz: "5ive shapes tones and experiments with analog waveforms. Our sound has always been described as an organic sound, it has natural truth to it and though it is not always a happy or uplifting message, you cannot deny it".

http://www.myspace.com/thereal5ive

The other band called 5ive (later known as "Five") is a pop boyband from England, existing from 1997 to 2001.