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If you need strings, then you can just create the symbolic list first and transform every entry into a string afterwards:

ToString[#, TraditionalForm] & /@ (Range[0, 3] Pi/τ)

If you have assigned a global value to tau and you can, as Marius already pointed out, use Block to localize the variable

τ = 4;
Block[{τ},
  ToString[#, TraditionalForm] & /@ (Range[0, 3] Pi/τ)
]