Good point about Connie Francis, Manfred.

She and some of the other girl singers did sing a few rock 'n' roll-like songs, but I would hesitate to call them rock 'n' roll singers. Connie Francis probably had more hits with ballads and 'teenage' love songs that were popular in those days. Some of the girl singers would do occasional up-tempo numbers which might just be classed with rock 'n' roll, but R&R purists would probably say they weren't!

Some girl singers had rather gentle vocal style which wouldn't probably have lent itself to rock 'n' roll. Lulu is an exception, as I would think Helen Shapiro could be too, as they both had strong voices that could belt out a song. But others like Sandie Shaw and Carole Deene (remember her?) were probably better at the 'teenage' love songs than anything else.

Then of course there were the girl groups, a whole new topic (Shangri-Las, Shirelles, etc.)!