William Clark Green has never shied away from soul-baring songwriting. The Texas native’s catalog, and the fan base he has built over 18 years as an independent artist, is a veritable autobiography, capturing eras of Green’s life that stretch from a hard-partying student at Texas Tech University to a father of two children, with a third due in May. Even with that, however, Watterson Hall stands out for the artist. Watterson Hall — which lent both the album and the title track its name — is a