It may be Jennifer Lopez's dream to put out an album of songs all sung in Spanish, but it was her husband's dream that helped her come up with her first single for it. After working on the Spanish-language album for the past three years with J. Lo, Marc Anthony woke her up one spring night with a little bit of inspiration.

"Marc woke up and said, 'I just had the craziest dream,' " Lopez recalled. " 'What was the dream?' And he said, 'Rocío Dúrcal was in this room and she was saying, "Come here, get in this room right now, listen to this. This song is for Jennifer," and she was singing a melody.' "

It was two weeks after the Spanish ranchera singer died after a long battle with cancer. "She was a very beautiful, famous singer who sang a million songs with Juan Gabriel and on her own," Lopez explained. "So of course, I'm like, 'That sounds good. Hold on one second.' "

Without any studio equipment nearby to capture the essence of the song before it slipped away from her half-asleep husband, Lopez grabbed the phone, called up the couple's answering machine and told him, "Sing it in here."

But the song, which Anthony claimed Dúrcal had told him was called "Que Heciste," sat on the machine for a few months before Lopez knew what to do with it. She'd already played the bulk of her forthcoming Spanish album, Como Ama Una Mujer -- which translates to How a Woman Loves -- to her record label and considered it mostly finished (it's due later this winter). "They loved it, they thought it was great," she said. "But I thought there should be one more song."

Later, when Lopez was talking with a girlfriend, she says she finally understood why it felt like something was missing from her album, and that "Que Heciste" filled the void. "I was like, 'You know what? I know why Rocío said that song was for me. I know what it's about now.' "

Lopez then called a Spanish writer she was working with to help her with adapting the lyrics -- though she speaks Spanish, she wanted to make sure she was expressing everything accurately. "You have to have a total command of the language, so I couldn't write it all myself, you know what I mean?" she said. "I had to really depend on people to express what I was feeling."

So when Lopez sat down with the Spanish writer, she explained that "Que Heciste" was about a very intense relationship. "She's saying to him ... 'What have you done with our relationship? With our life? We had everything and with your own hands, you destroyed our house,' " Lopez explained. "And I said to [him], 'Do you understand what I'm saying? ... Do you want me to say it in Spanish?' He goes, 'No, I understand, I got it,' and it literally took him 15 minutes to write the song."

Lopez said the song started as a ballad, but as they continued to work on it, it turned into "something harder, with a bit more of a rock tinge to it. It's an incredibly intense song," she continued. "It's passionate and a lot of fun, with a killer message. I love it, and I hope other people love it as much as I do." She paused, laughing, "because then I'll be OK."