I remember 8 of these quite well, and in fact, I have several versions of "Telstar" on my computer, including one by Bobby Rydell (don't ask).
10 Nearly Forgotten Number One Songs - The List Universe: "As the decades pass, some songs increase in popularity when they reach new listeners via concerts, advertising, or movie soundtracks. Others aren’t readily available commercially, and thus become nearly forgotten.
This list is of outstanding songs many casual listeners will not be familiar with, and placed #1 on the Billboard US Hot 100 chart. Please feel free to post how many of the selections you have heard along with your comments."