There are at least 3 bands with the same name (Poland, Romania, Slovenija):

1) Klon is a Polish Dark Hardcore Punk band formed in 1995. They recorder their first tape in March 1998 but it was of poor quality. A second guitarist, Piotr, then joined the trio. (see website for a more comprhensive history. Or you can write it here yourself ;) )
http://www.north-east.punk.pl/

2) Klon was an Alternative Rock band from Bucharest, Romania. Though it had a short life, the band managed to intrigue due to its good drive, beautiful vocals and lyrics.

3) KLON (Clone) is Slovenian rock band From Celje Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.