Jazz and animation make for strong bedfellows in “They Shot the Piano Player,” a film from Spanish directors Fernando Treuba and Javier Mariscal that represents an intriguing hybrid in all sorts of ways. It’s a love letter to the bossa nova movement that peaked in the 1960s, while at the same time it’s a sobering procedural that looks into the state murder of a musician that occurred as fascistic regimes rose to power in Latin America in the ’70s. It’s a documentary, or at least more nonfiction than not, although it has a wholly concocted framing device. And above and beyond the movie’s somewhat incongruous mixture of gritty political realism and giddy music appreciation, yes, it’s completely hand-drawn.