Final answer:
Urban folk singers in 1965 pioneered Folk Rock, combining rock effects with tuneful melodies and protest lyrics, reflecting the political and social mood of the era.
Step-by-step explanation:
By 1965, urban folk singers began blending rock effects with tuneful melodies and protest lyrics, creating a new genre called Folk Rock. This combination was a reflection of the serious new mood at the time. Folk Rock artists like Bob Dylan were instrumental in popularizing this blend of sounds which marked a significant evolution in the spectrum of popular music.
This genre incorporated electric instruments and drew from a rich tapestry of gospel, blues, country, jazz, and R&B influences, which resulted in a lighter rock sound that could carry the weight of political and social commentary within its lyrics.