From the LA TIMES article on Jorge Drexler:
"He insists he wasn't dissing Banderas' performance. On the contrary, he praised the actor for having the courtesy to give him a private preview before the show. The arrangement wasn't exactly Drexler's style, the songwriter concedes, espeically with Carlos Santana's incongruous electric guitar licks. But he gives Banderas an "A" for ardent."
He said: "I'm very bad at giving speeches, and I just really wanted to sing. since they didn't let me sing on the show but gave me forty-five seconds to do something, I just decided to do whatI do best."
He added: "I was happy with my life before the Oscars. The truth is, I earn my living honestly, writing songs on paper and playing the guitar in person. How many people can say they really enjoy their work? Is there a greater privilege in life?"
He apparently was a doctor before he went into music. I agree totally about the Santana guitar licks that made the song's melody indecipherable.
It's just another example of when a show or an event like this has a chance to choose between "class" or "crass", they'll always go with the crass.