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This month the Matrix is working with Britney Spears, Ricky Martin and David Bowie. This month three new records with its productions are coming out: by the college-rock singer-songwriter Liz Phair, the female pop-rock act Lillix, and the sister-led group the Troys.

One of the Matrix's more unlikely recent collaborators was Liz Phair, one of the most important female singer-songwriters to emerge from the indie-rock underground in the 90s. "I definitely have taken some arrows, but it's not any that stick," Ms. Phair said of her fans' reaction to the news that she was recording with the Matrix. "I'm very confident about the record and why I worked with them."

Ms. Phair recorded four songs with the Matrix and, like many of the artists who work with them, she decided to use all of those tracks on her album. Also like others, she was originally attracted to the Matrix because of their work with Ms. Lavigne. "I remember hearing 'Complicated' and being almost jealous," Ms. Phair recalled. "I thought, 'Aw, that's what I want to sound like.'"