He was a house tenor in Liège in the late 1920s, and closely connected to that city; he was also one of the first
classical singers to record songs in Walloon dialect (which is so incomprehensible that other French speakers need a translation).
But Rondelet also sang in France (he was a member of the intertwined opera theaters of Arras, Cambrai, Denain, Saint-Amand, Caen,
Lisieux and Bayeux at least in the 1923/24 season, but probably already before that). In January 1932, he participated in a
radio concert in Montréal, featuring only music related to Liège; he won't have traveled all the way to Canada for
that concert only, and I suppose his visit will have had to do with Montréal's considerable Walloon community.
Reference 1: L'Entr'acte, 5 October 1923; reference 2: Pourquoi Pas?, 19 February 1932; reference 3: CD booklet
"Opera.be – The Yves Becko collection"
I wish to thank Anton Bieber for the recording and label scan.