I think the Chancellor little band is the same, as they made Happy holliday / Mattinata (C 1053), because of Peter de Angelis (and Bob Marcucci). Composed by Al Caiola (bandleader-Componist)
P.S. The Everly brothers were also in Germany under the Heliodor label, even Frankie Avalon. Heliodor was a sub-label. In England the label was Columbia (HMV) or PYE and in parts of the world ABC-Paramount. Because of the different companies they made sub-labels to sell the records. In Belgium label CHAMP, in Holland CNR, in Italy Blue Bell and so on.
Heliodor is POLYDOR (Philips-Siemens).
So for the wrighs and taxpayments also.