Rachel Goodman’s top alt-rock and alt-pop songs of 2020. L to R; Row 1: Tame Impala, Caribou, Washed Out, Trace Mountains, The Big Moon, Future Islands. Row 2: Strfkr, Surfer Blood, Surf Rock Is Dead, Of Montreal, Hazel English, Suburban Living. Row 3: Jack River, Rolling Blackouts Coastal Fever,…