Conversation so far:
What were the names of some of the songs Son House sang?
Two songs would later be among Son House's best known: My Black Mama and Preachin' the Blues.
Were Son House's My Black Mama and Preachin' the Blues Son House's original songs or covers?
Son House heard James McCoy playing bottleneck guitar. Two songs he learned from McCoy would later be among his best known: My Black Mama and Preachin' the Blues.
How did Son House become a blues singer?
Son House heard James McCoy playing bottleneck guitar. Two songs he learned from McCoy would later be among his best known: My Black Mama and Preachin' the Blues.

Question: How did his attitude change?
Self-contained rewrite: How did Son House's attitude towards the blues change?