tokens: We would like to thank Mélanie Habouzit, Yohan Dubois, Joseph Silk, Gary Mamon, Stéphane Colombi, Rebekka Bieri, Andrea Negri, Mitch Begelman, Bhaskar Agarwal, Britton Smith, Mei Sasaki, and Paul Clark for valuable discussions and helpful contributions. We also thank the referee for insightful comments. We are very grateful for the free availability of the code music . We acknowledge funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013) via the ERC Grant ‘BLACK’ under the project number 614199 (TH, MAL, MV) and via the ERC Advanced Grant ‘STARLIGHT: Formation of the First Stars’ under the project number 339177 (RSK, SCOG). SCOG and RSK acknowledges support from the DFG via SFB 881, ‘The Milky Way System’ (subprojects B1, B2 and B8) as well as via SPP 1573 ‘Physics of the Interstellar Medium’. The simulations described in this paper were performed at the Jülich Supercomputing Centre.
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