Marcela Alejandra Bovio García (born October 17, 1979 in Monterrey, Nuevo León) is a Mexican mezzo-soprano singer and violinist. She was one of the founding members of the Mexican band Elfonía, she responded to a "casting call" of sorts for relatively unknown singers to be featured on Arjen Lucassen's Ayreon album The Human Equation where she landed the part of "Wife". She also sang on the bonus disc of the re-release of the first Ayreon album The Final Experiment.
Later, she was picked as the lead singer of another Lucassen project, Stream of Passion (in which she also plays the violin, one of the defining sounds of the band) who have released three full length albums; Embrace the Storm, The Flame Within and Darker Days, as well as a live album, Live in the Real World. After Lucassen's departure from the band in 2007, Bovio became the sole composer of the band.