Many KDE applications (such as KDevelop, Konqueror, and Kate) use vertical tabs. I won't argue for or against their "usability" but I just thought I'd emphasize than Amarok is in good company.
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Many apps use vertical tabs
Many KDE applications (such as KDevelop, Konqueror, and Kate) use vertical tabs. I won't argue for or against their "usability" but I just thought I'd emphasize than Amarok is in good company.