The Ridiculous Sound of a Fretless Guitar - YouTube
How The Beatles came to use a Riverside-built guitar on the 'White Album' – Press Enterprise
Fretless Bass: Surprising Origins and Famous Players | Stringjoy
Amazon.com: TARIO 39 Inch Fretless Classical Guitar Full Size Acoustic Guitar Spruce top Ovangkol back and sides Okoume neck laurel fingerboard : Musical Instruments
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The Beatles, Frank Zappa & Erkan Oğur: Fretless Guitar Innovation - TAQS.IM
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George Harrison and John Lennon's fretless guitar sells for over £200,000
Eastwood PB Fretless - Electric Guitar – Eastwood Guitars