Quote: "The song of the righteous is a prayer unto me, and it shall be answered with a blessing upon their heads." D&C 25:12
Marriage/Wedding sheet music (47 Free Arrangements)
You could also filter these songs (limit them) by type. Currently:

2 part…, Duet, Primary…, Vocal Solo…, Youth Choir…
By:
Mary Higginbotham Jones
Topics:
Vocal Solo…, Agency…, Blessings, Children, Creation…, Death/Funeral, Faith, Happiness…, Home/Family, Individual Worth…, Knowledge/Truth, Marriage/Wedding, Pioneers, Plan of…, Temple, Testimony, Young Women…, Primary with…, Women Unison

Primary…
By:
Nathan Howe
Topics:
Baptism, Faith, Holy…, Marriage/Wedding, Missionary Work, Plan of…, Primary Song…


SATB
By:
Stephen Chase
Topics:
Blessings, Christ, Eternal Life…, Family, Happiness…, Heaven…, Home/Family, Love, Marriage/Wedding, Obedience…, Peace, Trials

Guitar, Guitar Chords…, Hand…, Ukulele
By:
Amanda Christensen
Topics:
Aaronic Priesthood, Agency…, Atonement…, Baptism, Blessings, Charity, Chastity/Purity, Children, Children's Songs, Christ, Christmas, Comfort…, Commandments, Courage, Death/Funeral, Diligence…, Duty, Earth/Nature, Easter, Enthusiasm, Eternal Life…, Example, Faith, Family, Fatherhood…, Friend/Friendship, Genealogy…, Goals, Gospel, Gratitude…, Guidance, Happiness…, Heaven…, Heavenly Father, Holy…, Home/Family, Honesty/Integrity, Hope, Individual Worth…, Instrumental Music…, Kindness, Knowledge/Truth, Learning, Light/Sun, Love, Lullabies, Marriage/Wedding, Missionary Work, Motherhood…, Nature, Obedience…, Peace, Pioneers, Plan of…, Praise, Preparedness, Prophets, Repentance, Righteousness…, Sabbath, Savior, Self-Improvement, Self-control, Service, Temple, Testimony, Trust in…, Truth…, Work, Worthiness, Book of…, Harp, Languages, Piano, Simplified Arrangement…

SATB, Primary…, SATB quartet, Youth Choir…
By:
Mary Higginbotham Jones
Topics:
Blessings, Children, Christ, Example, Faith, Fatherhood…, Genealogy…, Guidance, Heavenly Father, Home/Family, Kindness, Learning, Love, Marriage/Wedding, Obedience…, Pioneers, Plan of…, Priesthood, Testimony, Work, Simplified Arrangement…

SA, 2 part…, Duet
By:
Mary Higginbotham Jones
Topics:
Diligence…, Example, Faith, Home/Family, Hope, Kindness, Love, Marriage/Wedding, Patience, Plan of…

SATB, SATB quartet, Youth Choir…
By:
Charles E. Davis, Maria A. Davis
Topics:
Blessings, Chastity/Purity, Christ, Eternal Life…, Example, Faith, Family, Genealogy…, Happiness…, Holy…, Individual Worth…, Knowledge/Truth, Learning, Love, Marriage/Wedding, Revelation, Savior, Service, Temple, Truth…, Worship, Worthiness, Zion, Arise and…, Be Strong…, Come unto…, Embark in…, Stand in…, We Believe…


SA, Duet
By:
Aleta Clegg
Topics:
Children, Children's Songs, Eternal Life…, Family, Genealogy…, Heaven…, Holy…, Home/Family, Love, Marriage/Wedding, Plan of…, Service, Temple, Medley
You can also get a (possibly more complete) list of hymns for this topic (Marriage/Wedding) here.