Magnetic audio-recording tape

A magnetic audio-recording tape comprising a non-magnetizable flexible support and at least one magnetic coating layer provided on said support wherein (a) the support surface on which said magnetic coating layer is formed has a maximum value of an average wavelength distribution of surface roughness measured in the recording direction over the length of more than 10 mm at a wavelength of the surface roughness not less than 475 .mu.m and at a frequency of the surface roughness not higher than 100 Hz when spectrally analyzed according to the following equation (1), and the maximum value of said wavelength distribution in the wavelength region of from 475 .mu.m to 2.38 mm and the frequency range of from 20 Hz to 100 Hz is not higher than about 0.1 .mu.m;

• f=v/.lambda. (1)
• wherein f is the frequency of the surface roughness in Hz, v is the relative velocity between the magnetic head and the tape in mm/sec, and .lambda. is the wavelength of the surface roughness in mm in the recording direction, and (b) said magnetic coating layer comprises a finely divided ferromagnetic alloy material dispersed in a binder.