Each musical group tends to have its own sound, at least until they reinvent themselves (think early and late Beatles for example). The sounds of the groups compared with each other don't usually sound much the same (think Rick Nelson & The Stone Canyon Band vs Fats Domino).
The "sound alike" I referred to was between groups (example: every rap group you've ever heard).
The "sound alike" I referred to was between groups (example: every rap group you've ever heard).