What makes 21 by Hunter Hayes notable?

'21' debuted at number 3 on the Billboard Top Country Albums chart and showcased Hayes' growth as a songwriter and musician. It received positive reviews for its production quality and lyrical depth, contributing to his reputation in the country genre during a time when he was transitioning from teen heartthrob to mature artist. Released in January 2015, '21' is Hunter Hayes' second studio album, following his self-titled debut from 2011. At this point in his career, Hayes was solidifying his presence in the country music scene after achieving commercial success and critical acclaim, making this album a significant step in his artistic progression.