Conversation so far:
What was Tom Lehrer's style?
At the time, radio stations would not give Lehrer air time because of his controversial subjects.
What controversial subjects?
The album--which included the macabre "I Hold Your Hand in Mine", the mildly risque "Be Prepared", and "Lobachevsky" (regarding plagiarizing mathematicians)-.
What genre of music did he make?
CANNOTANSWER.
Who were his influences?
'what a pleasant little waltz'...
Are there any other interesting aspects about this article?
Lehrer later recalled, "Lacking exposure in the media, my songs spread slowly.
Like herpes, rather than ebola..
Did his music become popular?
After one summer, he started to receive mail orders from all parts of the country.

Question: What happened in that summer?
Self-contained rewrite: What happened in that summer when Tom Lehrer started to receive mail orders?