I am looking for this jingle since decades, but I confess I cannot really identify the call letters by the singing.
Norman suggested it may be a W.B. Tanner production.
https://soundcloud.com/ompro-1/wamg
I heard this jingle on TROS radio, the Netherlands, in the 70s/80s. DJ Ad Roland used it in the opening for his weekly American Top 10 countdown feature within his radio show called Europarade.
Can anyone help?