SOUR is a formulaic, predictable breakup album. A collection of similar sounding ballads, it mostly follows the same song structure of her hit single "drivers license": muted moody verses, belted chorus and layered vocal effect on the bridge.
Her indie girl voice is better than most, but she has an unpleasant timbre at times with belting that quickly becomes flat and repetitive. "good 4 u" and "jealousy jealousy" do well to keep things fun with their angsty pop rock, but she dwells on the same situation over and over and over again. The lyrics are clunky and become boring.
This sound and style has been done 10 times better before by her obvious influencers. Olivia has the range and talent, but SOUR isn't the best showcase of it. While not a bad album by any means, it's nothing unique and it doesn't live up to the hype.