I've been a Spanish Ballads enthusiast my entire life; here goes the list.
Jose Luis Perales, Joan Manuel Serrat, Roberto Carlos, Camilo Sesto, Raphael, Juan Gabriel, Julio Iglesias, Jose Jose, Sandro, Leonardo Favio, Leo Dan, Danny Daniel, Rocio Durcal and Jurado, Los Angeles Negros, Los Terricolas, Rodolfo, Lucho Gatica (older), Armando Manzanero, Jose Luis Rodriguez, Salvatore Adamo (en espanol), Marco Antonio Solis, Luis Miguel (Romances), Ricardo Arjona, Cristian Castro, Charles Aznavour (French, but he sings in spanish also), Emmanuel (those written by Manuel Alejandro), Ricardo Montaner (first 3-4 cd's), Angela Carrasco (those written by Camilo Sesto), Danny Rivera, Nicola di Bari (Italian, but sings in spanish), Nelson Ned, Lolita Flores, Palito Ortega, Nino Bravo, Los Panchos (older), Carlos Gardel (Tango, but you can't not love his music), Basilio, Emilio Jose, Ana Gabriel, Manolo Galvan, Franco de Vita, Rudy la Scala, Yolandita Monge, Sonia Silvestre, Mari Trini, Pimpinela, Isabel Pantoja,