Question: To which profession do both Bill Leeb and Bernie Leadon belong?

Context paragraphs:
Bernie Leadon: Bernard Mathew Leadon III (pronounced "led-un"; born July 19, 1947) is an American musician and songwriter, best known as a founding member of Eagles.  Prior to Eagles, he was a member of three pioneering and highly influential country rock bands: Hearts & Flowers, Dillard & Clark, and the Flying Burrito Brothers.  He is a multi-instrumentalist (guitar, banjo, mandolin, steel guitar, dobro) coming from a bluegrass background.  He introduced elements of this music to a mainstream audience during his tenure with the Eagles.

Tom Leadon: Tom Leadon (born 1952) is an American musician.  He is one of the founding members of Tom Petty's original band, Mudcrutch; and is still lead guitarist in the same band, following its revival in 2007.  He is the brother of Bernie Leadon, who is famous for formerly being the lead guitarist of The Eagles.

Bill Leeb: Wilhelm Anton "Bill" Leeb (born 21 September 1966, Vienna, Austria) is an Austrian-Canadian electronic musician and record producer.  He is best known for being a founding member of the industrial music group Front Line Assembly.  Additionally, Leeb is known for his work with groups such as Noise Unit, Delerium, Intermix, and Skinny Puppy, among others.

Front Line Assembly discography: Front Line Assembly, a Canadian Vancouver-based electro-industrial band, has released sixteen studio albums, three live albums, numerous singles and compilations, and two video game soundtracks.  With Bill Leeb being the founder and sole permanent member of the band, Michael Balch, Rhys Fulber and Chris Peterson were acting as long-time members during different periods of time.  Currently, Jeremy Inkel and Jared Slingerland are official members.

Faces, Forms &amp; Illusions: Faces, Forms & Illusions is an album by the Canadian ambient/electronic music group Delerium that was released on January 6, 1989 on the Dossier label.  The album was re-issued in 1997 on Cleopatra Records with the bonus track "Dark Star" added and "Hidden Mask" removed.  All songs written by Bill Leeb, except "Monuments of Deceit" and "Mecca", which were co-written by Bill Leeb and Michael Balch.

Orbiting Cathedrals: Orbiting Cathedrals is the only album by Pro>Tech, a side project of Canadian industrial musician Bill Leeb with the help of industrial musician Chris Peterson.  The project was launched in 1997 in the wake of the release of the album [FLA]vour of the Weak from industrial band Front Line Assembly, which at the time consisted of Leeb and Peterson.  "Orbiting Cathedrals" is supposed to be a musical twin of "[FLA]vour of the Weak".  The album was released through German label Dossier and re-released in 2000 by Hypnotic.  Tracks from "Orbiting Cathedrals" have also appeared on Cryogenic Studios and Cryogenic Studio, Vol.  2, compilation albums with songs from Front Line Assembly and related projects.

The Initial Command: The Initial Command is the first album released by Canadian Industrial band Front Line Assembly.  Their first two releases, Nerve War and Total Terror, were demo tapes.  The music was created mostly by Bill Leeb with some help from Michael Balch.  Since the 1987 release of The Initial Command, the album has been re-issued twice.  The first release, in 1992, contained no changes.  The second release, in 1997, contained two new tracks and new cover art.

Nerve War: Nerve War is the first release by the Canadian band Front Line Assembly (known as Frontline Assembly at the time).  Having a limited cassette release (between 50 and 100) in 1986, it remains the most sought-after release from Bill Leeb and company.  The songs on the tape sound more abrasive and industrial than Leeb's more-recent output which leans more toward an EBM style.  It has never been officially released after Front Line Assembly became more popular (supposedly the master tapes were lost), however, MP3s of it have appeared on the Internet since about 2002.

The Scottsville Squirrel Barkers: The Scottsville Squirrel Barkers were a San Diego-based bluegrass group best known as the band that launched the career of founding Byrds' member, Chris Hillman and founding Eagles' guitarist-songwriter, Bernie Leadon.  The lineup included Hillman on mandolin, future Hearts & Flowers member Larry Murray on dobro, Ed Douglas on stand-up bass, Gary Carr on guitar, and future Flying Burrito Brothers and Country Gazette member, Kenny Wertz on banjo.  Leadon would replace Wertz on banjo when he left the group to join the Air Force in 1963 (Wertz would return the favor by replacing Leadon in the Flying Burrito Brothers when he left that group to start the Eagles in 1971).

Tenebrae Vision: Tenebrae Vision is the only album of Canadian industrial band Cyberaktif which consisted of cEvin Key and Dwayne R. Goettel of Skinny Puppy and former Skinny Puppy member Bill Leeb of Front Line Assembly.  For "Cyberaktif", Leeb adopted his stage name, Wilhelm Schroeder, he had used while with Skinny Puppy.  The album was released in 1991 through Wax Trax!  and features Blixa Bargeld of German industrial band Einstürzende Neubauten.

Supporting paragraphs: Bill Leeb Bernie Leadon
Answer: musician