FabioLolix [1] filed a request to merge soundcloud-bin [2] into soundcloud-desktop-bin [3]:
They are the same package. soundcloud-bin was created by the upstream developer since soundcloud-desktop-bin was behind with updates with the previous maintainer, upstream developer have been added as co- maintainer [1] https://aur.archlinux.org/account/FabioLolix/ [2] https://aur.archlinux.org/pkgbase/soundcloud-bin/ [3] https://aur.archlinux.org/pkgbase/soundcloud-desktop-bin/
