Conversation so far:
What year did the first The Carpenters single release?
1969
What was the name of the single released in 1969 by The Carpenters?
Ticket to Ride“
Were The Carpenters successful with the single Ticket to Ride?
Ticket to Ride was released as a single on November 5, and became a minor hit for the Carpenters
Where did The Carpenters peak on the billboards with Ticket to Ride?
No. 54 on the Billboard Hot 100 and the Top 20 of the Adult Contemporary chart
What was the next single The Carpenters released in the time period after Ticket to Ride?
(They Long to Be) Close to You“
What date was I wont last a day without you by The Carpenters released?
03/25/1974
Did I Won't Last a Day Without You by The Carpenters chart on the billboards?
reaching number 11 on the Billboard Hot 100 chart and number one on the easy listening chart
Was there any other singles of note by The Carpenters besides Ticket to Ride, Close To You, I Won't Last A Day Without You?
Top of the World“ was the Carpenters' second Billboard No. 1 hit

Question: Which single was the most successful?
Self-contained rewrite: Which single was the most successful for the The Carpenters?