Quote “The mandolin and guitar duet is the RONGO brothers. Michael on mandolin and GUIDO on guitar. Michael was a fine mandolist and a very nice chap. His brother was a wrestler, not sure whether amateur or professional, but tragically died from injuries received during a bout” end quote.
(edited for brevity). Duet around the 1minute 7-11 sec.
Unfortunately, no satisfactory picture of Guido.
Guido wrestling professionally from as early as 1935 until at least 1956. Here at the Royal Albert Hall in 1952