@inproceedings{guo-etal-2026-sphere,
    title = "{SPHERE}: Automatic Music Upmixing via Audio Language Model Post-Training with Spatial Heuristics Rewards",
    author = "Guo, Zixun  and
      Murdock, Calvin  and
      Parekh, Sanjeel  and
      Brimijoin, W. Owen  and
      Dixon, Simon  and
      Reiss, Joshua  and
      Ananthabhotla, Ishwarya",
    editor = "Lee, Hung-Yi  and
      Dev, Sunipa  and
      Li, Jessy  and
      Elliott, Desmond",
    booktitle = "Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing",
    month = oct,
    year = "2026",
    address = "Budapest, Hungary",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2026.emnlp-main.2673/",
    pages = "60827--60838",
    ISBN = "979-8-89176-459-0"
}