LOS ANGELES - The lead singer of Megadeth has sued the band's former bass player for allegedly using the name of the group without permission in an ad for musical equipment.

David Mustaine claims in the lawsuit filed Monday in Superior Court that he and David Ellefson entered into a settlement agreement in February that restricts the guitarist's use of the band name.

"Ellefson shall not use, or authorize anyone else to use, the work or mark ‘Megadeth" to advertise, market or promote any person, band, company, organization, product or services without Megadeth's prior express written permission," according to the lawsuit.