Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:

Broadcaster: RAI Italian Radio and Television, Rome 1971

Frequency: 6.010MHz

RX location: Ancaster, Ontario, Canada

Receiver and antenna: Hallicrafters S-52 using a longwire antenna

Notes: RAI, Italian Radio and Television from Rome, had an interval signal that was described as a mechanically generated chirping canary, mechanical nightingale and even an Italian Sparrow. The station broadcast on a number of different frequencies in English (my QSL has them on 6.010 MHz), however in this recording, that was made circa 1971, the station identification is given in Italian.