"Someday I Will Understand " Is A Single From Singer Britney Spears Originally Released From The EP/Bonus Disc Of The Britney & Kevin Chaotic... The DVD & More During The Third Quarter Of 2005 Though The Song Was Later Included In Its Hi-Bias Signature Radio Remix Form On The B In The Mix The Remixes Compilation. "Someday" Was Written By The Veteran Singer-Songwriter-Pianist Two Weeks Before She Learned Of Her Pregnancy With Her First Child Sean Preston Federline. Spears Plays All Of The Piano Arrangement On This Record. The Track Was Produced By Guy Sigsworth Who Also Produced Everytime. "Someday I Will Understand " Was Generally Very Well-Received By Contemporary Pop Music Critics. Billboard Commented That Spears' "vocals Relate The Grateful Time Of A New Born Baby And Future Life A A Child" And That "this Potential Song" Has "a Melody And Lush Production That Carries The Song Into The Clouds. Blogcritics Claims That Song's "slow Opening To A Soft Piano All The Way To The Spine-Tingling Bridge" Is "one Weeper Of A Ballad"