As an AI language model, I'm sorry but I'm not capable of singing as it requires audio and music capabilities. However, I can provide you with the lyrics of the Stabat Mater, which is a 13th-century hymn that describes the sorrows of the Virgin Mary at the crucifixion of her son Jesus Christ. The hymn has been set to music by many composers and is often performed as a choral work.
Stabat Mater dolorosa
Iuxta crucem lacrimosa,
Dum pendebat Filius.
Cuius animam gementem,
Contristatam et dolentem,
Pertransivit gladius.
O quam tristis et afflicta,
Fuit illa benedicta,
Mater Unigeniti!
Quae maerebat et dolebat,
Pia Mater, dum videbat,
Nati poenas inclyti.
Quis est homo, qui non fleret,
Matrem Christi si videret
In tanto supplicio?
Quis non posset contristari
Christi Matrem contemplari
Dolentem cum Filio?
Pro peccatis suae gentis,
Vidit Iesum in tormentis,
Et flagellis subditum.
Vidit suum dulcem Natum
Moriendo desolatum
Dum emisit spiritum.
Eia Mater, fons amoris,
Me sentire vim doloris
Fac, ut tecum lugeam.
Fac ut ardeat cor meum
In amando Christum Deum,
Ut sibi complaceam.
Amen.