 " Si Una Vez " was written by Selena y Los Dinos backup dancer and vocalist Pete Astudillo . The song was co @-@ written by Selena 's brother @-@ producer A.B. Quintanilla who , along with Argentine musician Bebu Silvetti , served as producers . Keyboardist of the group , Ricky Vela retold in a 2002 interview how the band hired a professional trumpist to record parts of the song . " Si Una Vez " is a Spanish @-@ language mariachi fusion track with influences of cumbia and Latin dance music . Author Deborah Paredez called " Si Una Vez " as having punk music undertones . In 2002 , A.B. spoke on how Amor Prohibido was experimental music @-@ heavy and commented on how " Si Una Vez " was an example of his ideas of keeping the band 's image modern . The song makes use of the Guitarrón guitar under a cumbia beat . 
