Related Clues:

• Paul Robeson, for one
• Years and years and years and ...
• Low-pitched
• Near-eternity
• Lo-o-ong time
• Many, many years
• McCartney played it in the Beatles
• Type of clef
• Geologic time division
• Amazingly long time
• An eternity
• Longish span
• Stereo knob
• Largemouth fish
• Angler's catch, perhaps