Who sang what in Les Miserables?

Answer 1

If you're asking about characters...

• Overture - Instrumental (Orchestra)
• Prologue: Work Song - Chain Gang, Javert and Valjean
• Prologue: On Parole - Valjean, Farmer, Labourer, Innkeeper's Wife and Innkeeper
• Prologue: Valjean Arrested, Valjean Forgiven - Constables and Bishop
• Prologue: What Have I Done? - Valjean
• At the End of the Day - Fantine, The Poor, Foreman, Workers, Factory Girls and Valjean
• I Dreamed a Dream - Fantine
• Lovely Ladies - Fantine, Sailors, Wh*res, Old Woman, Crone and Pimp
• Fantine's Arrest - Fantine, Bamatabois, Javert and Valjean
• The Runaway Cart - Onlookers, Valjean, Fauchelevent and Javert
• Who Am I? - Valjean
• Fantine's Death - Fantine and Valjean
• The Confrontation - Javert and Valjean
• Castle on a Cloud - Young Cosette and Madame Thénardier
• Master of the House - Thénardier, Madame Thénardier and Chorus
• The Well Scene - Valjean and Young Cosette
• The Bargain / The Thénardier Waltz of Treachery - Thénardier, Valjean, Madame Thénardier and Young Cosette
• Suddenly - Valjean (2012 film only)
• Look Down - Beggars, Gavroche, Old Woman, Prostitute, Pimp, Enjolras and Marius
• The Robbery / Javert's Intervention - Thénardier, Madame Thénardier, Éponine, Marius, Valjean and Javert
• Stars - Javert
• Éponine's Errand - Marius and Éponine
• The ABC Café / Red and Black - Students, Enjolras, Marius, Grantaire and Gavroche
• Do You Hear the People Sing? - Enjolras, Grantaire, Students and Beggars
• I Saw Him Once - Cosette
• In My Life - Cosette, Valjean, Marius and Éponine
• A Heart Full of Love - Marius, Cosette and Éponine
• The Attack on Rue Plumet - Thénardier, Thieves, Éponine, Marius, Valjean and Cosette
• One Day More - Valjean, Marius, Cosette, Éponine, Enjolras, Javert, Thénardier, Madame Thénardier and Company
• At the Barricade (Upon These Stones) - Enjolras, Javert, Marius, Éponine and Valjean
• On My Own - Éponine
• Building the Barricade (Upon These Stones) - Enjolras, Students and Army Officer
• Javert's Arrival - Javert and Enjolras
• Little People - Gavroche, Students, Enjolras and Javert
• A Little Fall of Rain - Éponine and Marius
• Night of Anguish - Enjolras, Valjean, and Students
• The First Attack - Enjolras, Grantaire, Students, Valjean and Javert
• Drink with Me - Grantaire, Students, Women and Marius
• Bring Him Home - Valjean
• Dawn of Anguish - Enjolras and Students
• The Second Attack (Death of Gavroche) - Enjolras, Marius, Valjean, Grantaire, Gavroche and Students
• The Final Battle - Army Officer, Grantaire, Enjolras and Students
• The Sewers - Instrumental (Orchestra)
• Dog Eats Dog (The Sewers) - Thénardier
• Javert's Suicide - Valjean and Javert
• Turning - Women of Paris
• Empty Chairs at Empty Tables - Marius
• Every Day (Marius and Cosette) - Cosette and Marius
• A Heart Full of Love (Reprise) - Cosette, Marius and Valjean
• Valjean's Confession - Valjean and Marius
• Wedding Chorale - Guests, Thénardier, Marius and Madame Thénardier
• Beggars at the Feast - Thénardier and Madame Thénardier
• Epilogue: Valjean's Death - Valjean, Fantine, Cosette, Marius and Éponine
• Epilogue: Finale - Full Company

If you're asking about which actors played which part, I'd suggest do some digging on the internet around Broadway sites.