Grumpy Old Geeks Media The Lefsetz Letter Media The Lefsetz Letter 2 mentions in 1 episode A newsletter the hosts discuss in relation to accounts of the music industry. Mentions 246: Ground Control to Grumpy Tom Feb 12, 2018 1:07:12 we talked about the left sits letter a lot. He started off as commenting on the music industry 1:07:33 That is all quietly taking place on his letter