Listening to Björk’s new album, "Bastards," is a sonically–challenging experience. Her songs aren't just background music; they pull you in and demand your full attention. This new album has 13 of Björk’s songs remixed in various ways. If you’re running late to class, listen to “Crystalline (Omar Souleyman Remix)” or “Sacrifice (Death Grips Remix)” to bring out your inner "Mission Impossible" fast–paced walk down Locust. However, if you choose to listen to “Virus (Hudson Mohawke Peaches & Guacamol Remix)” or “Moon (The Slips Remix)” instead, the songs' relaxing notes may encourage you to go straight back to bed. Although these songs are not easy listening, they are perfect for Penn students who are always up for a challenge.

Grade: B+

Sounds best when: You're relaxing at home but have misplaced your Sudoku book.

99–cent download: Virus (Hudson Mohawke Peaches & Guacomol Remix)