I’m not a SiriusXM subscriber, but here’s what I think after a quick perusal of the wiki’s list of channels. I find Horizon’s music more eclectic than anything on offer here, but I digress.
Horizon Pulse - Hits 1, The Pulse, a bit of SiriusXMU
Horizon Bass Arena (and Hospital Records to some extent) - BPM, Diplo’s Revolution
Horizon Block Party - Hip-Hop Nation, Shade 45
Horizon XS/Rocks/Epitaph Records - The Spectrum, Alt Nation, Octane