Performed by the Glee Cast, "Alone" is a powerful rendition of the classic song by The Supremes. The track appears on the comprehensive "Glee - The Music, The Complete Season One CD Collection," released in 2010, which documents the series' debut season. This recording exemplifies the show's signature approach to covering iconic pop and soul standards, blending original vocal arrangements with the distinctive harmonies of the ensemble. The song serves as a pivotal moment in the series, highlighting the characters' emotional struggles and the group's ability to reinterpret timeless material for a modern audience. Its inclusion in the complete season collection underscores its significance within the broader musical landscape of the television series and its impact on contemporary pop culture.