Along with the gerund and infinitive, the past participle (cantado) in Spanish, as in English, is an nonfinite verb form (does not express person, tense, or mood but does express gender and number) that can be used as an adjective and to form compound tenses, be it active or passive voice.
-As an adjective.
La mujer vestida de rojo es muy guapa.
-As a compound tense in active voice.
Los chicos han interpretado cancionestoda la noche.
-As a compound tense in passive voice.
Las canciones fueron interpretadas por los chicos toda la noche.
The following participles are considered irregular because of their distinct endings: abierto (from the verb abrir), absuelto (from the verb absolver), cubierto (from the verb cubrir), disuelto (from the verb disolver), hecho (from the verb hacer), muerto (from the verb morir), puesto (from the verb poner), resuelto (from the verb resolver), roto (from the verb romper), satisfecho (from the verb satisfacer), visto (from the verb ver), vuelto (from the verb volver).
The following verbs have regular participles as well as irregular participles: elegir (elegido and electo), freír (freído and frito), imprimir (imprimido and impreso), prender (prendido and preso), proveer (proveído y provisto). As adjectives, irregular participles are the ones usually used.