Of the 20 best-selling singles at that point, eight had been included on Glee: The Music, Volume 1: "Don't Stop Believin'", "Defying Gravity" (335,000 copies), "Somebody to Love" (315,000), "Sweet Caroline" (187,000), "Take a Bow" (181,000), "Keep Holding On" (166,000), "Taking Chances" (163,000), and "Alone" (159,000).
Af de 20 bedst sælgende singler, er otte inkluderet på Glee: The Music, Volume 1 : "Don't Stop Believin'", "Defying Gravity" (335.000 eksemplarer), "Somebody to Love" (315.000), "Sweet Caroline" (187.000), "Take A Bow" (181.000)," Keep Holding On "(166.000)," Taking Chances "(163.000), og" Alone "(159.000).