Final answer:
The two rock-era innovations that "Louie Louie" and "I'll Get Around" signify are multitrack recording and surf rock.
Step-by-step explanation:
The two rock-era innovations that "Louie Louie" and "I'll Get Around" signify are a) Multitrack recording and Surf Rock. Multitrack recording allowed for the layering and mixing of multiple instruments and vocal tracks, creating a richer and more complex sound in recordings. Surf Rock, on the other hand, was a sub-genre of rock music that emerged in the 1960s and was characterized by its upbeat and lively sound, often incorporating elements of surf culture.