I recently contributed a vocal track that became infinite loop #106 for an eternally looping selection of one minute pieces. You can listen to it here. The series is called  THESIS RECURRING and includes fine contemporary ambient and modern classical artists such as Taylor Deupree, Rafael Anton Irisarri, Pan American and Benjamin Finger.  Each loop is accompanied by a stunning photograh from visual artist Gregory Euclide. The series is available via THESIS as an iOS app. There is a great review of this project with more details over Headphone Commute.