Although I think that they only occasionally received label credit, The Chantones backed up Jack Scott on almost all of his hit records -- and they also had a separate career in their own right. Their history has now been chronicled in a series of three booklets by author/historian Paul Langan and original Chantones member Jack Grenier.
https://www.paullangan.com/2023/06/press-release-part-3-history-of.html