Who popularized the electric guitar in rock?

Invented in 1931, the amplified electric guitar was adopted by jazz guitarists, who sought to be able to do single-note guitar solos in large big band ensembles. Early proponents of the electric guitar on record included Les Paul, Lonnie Johnson, Sister Rosetta Tharpe, T-Bone Walker, and Charlie Christian.

The answer here is hills.

Clay is a good medium to sculpt because its shape can be changed easily