diff --git a/src/descargas/Actor.java b/src/descargas/Actor.java
index 34f41ff..af76121 100644
--- a/src/descargas/Actor.java
+++ b/src/descargas/Actor.java
@@ -1,6 +1,5 @@
 package descargas;
 
-public class Actor {
-	String nombre;
+public class Actor extends Persona {
 
 }
diff --git a/src/descargas/Artista.java b/src/descargas/Artista.java
index 6ed83b1..80edfc2 100644
--- a/src/descargas/Artista.java
+++ b/src/descargas/Artista.java
@@ -1,5 +1,5 @@
 package descargas;
 
-public class Artista {
-	String nombre;
+public class Artista extends Persona{
+	
 }
diff --git a/src/descargas/Contenido.java b/src/descargas/Contenido.java
index 2b76561..bd7ebef 100644
--- a/src/descargas/Contenido.java
+++ b/src/descargas/Contenido.java
@@ -4,6 +4,7 @@ public class Contenido {
 
 	private String id;
 	private String titulo;
+	private String calidadString;
 
 	public Contenido() {
 	}
@@ -12,5 +13,5 @@ public Contenido(String id, String titulo) {
 		this.id = id;
 		this.titulo = titulo;
 	}
-	
+
 }
\ No newline at end of file
diff --git a/src/descargas/Director.java b/src/descargas/Director.java
index 213a0b7..043e801 100644
--- a/src/descargas/Director.java
+++ b/src/descargas/Director.java
@@ -1,5 +1,5 @@
 package descargas;
 
-public class Director {
-	String nombre;
+public class Director extends Persona{
+
 }
diff --git a/src/descargas/Multimedia.java b/src/descargas/Multimedia.java
new file mode 100644
index 0000000..5975054
--- /dev/null
+++ b/src/descargas/Multimedia.java
@@ -0,0 +1,21 @@
+package descargas;
+
+public abstract class Multimedia extends Contenido {
+
+	String calidadString;
+
+	public Multimedia() {
+		super();
+	}
+
+	public Multimedia(String id, String titulo) {
+		super(id, titulo);
+	}
+
+	public abstract String getCalidadString() ;
+
+	public void setCalidadString(String calidadString) {
+		this.calidadString = calidadString;
+	}
+
+}
\ No newline at end of file
diff --git a/src/descargas/Musica.java b/src/descargas/Musica.java
index 85c010b..05ade7a 100644
--- a/src/descargas/Musica.java
+++ b/src/descargas/Musica.java
@@ -1,10 +1,18 @@
 package descargas;
 
-public class Musica extends Contenido {
+public class Musica extends Multimedia {
+	
 	Artista artista;
 	
 	public Musica(String id, String titulo) {
 		super(id, titulo);
 	}
+
+	@Override
+	public String getCalidadString() {
+		// TODO Auto-generated method stub
+		return calidadString;
+	}
+	
 }
 
diff --git a/src/descargas/Pelicula.java b/src/descargas/Pelicula.java
index 6dcddda..d03127c 100644
--- a/src/descargas/Pelicula.java
+++ b/src/descargas/Pelicula.java
@@ -1,11 +1,19 @@
 package descargas;
 
-public class Pelicula extends Contenido {
+public class Pelicula extends Multimedia {
 
 	Director director;
-	Actor[] actoresPrincipales;
+	Persona[] actoresPrincipales;
+	
 	
 	public Pelicula(String id, String titulo) {
 		super(id, titulo);
+	}
+
+
+	@Override
+	public String getCalidadString() {
+		// TODO Auto-generated method stub
+		return calidadString;
 	} 
 }
diff --git a/src/descargas/Persona.java b/src/descargas/Persona.java
new file mode 100644
index 0000000..7af0e14
--- /dev/null
+++ b/src/descargas/Persona.java
@@ -0,0 +1,11 @@
+package descargas;
+
+public class Persona {
+
+	String nombre;
+
+	public Persona() {
+		super();
+	}
+
+}
\ No newline at end of file