There are multiple artists with this name:
1) Odal is a pagan black metal band from Germany. Their line-up consists of Taaken (guitars, vocals), Grroll (drums), and Wolfhetan (bass). They have released three full-length albums and a series of splits and EPs, with lyrical themes including paganism, blood, sorrow, anger and nature.
2) Odal is a noise / power electronics act. It is the oldest project of the notorious Peter Zincken who is also known as Dr. Bibber and frontman of the legendary FCKN' BSTRDS these days. Started around 1985 releasing tapes on his own label BloedvlagProdukt.
3) Odal is a RAC band from Spain.