What makes Year of Sunday by Seals and Crofts notable?

'Year of Sunday' features the hit single 'Summer Breeze,' which contributed to the duo's growing popularity, reaching No. 6 on the Billboard Hot 100. The album is noted for its rich harmonies and lyrical depth, further cementing Seals and Crofts' influence in the folk rock scene during the early 1970s. Released in November 1971, 'Year of Sunday' was Seals and Crofts' third studio album, following their successful breakthrough with 'Summer Breeze.' At this point in their career, they were solidifying their presence in the soft rock genre and expanding their musical style, which would define their subsequent releases.