From the early 1970s, MacLean was in demand internationally as a reader of his own poetry. He would start a reading of a poem by describing the images, then read the poem first in Gaelic and again in English, emphasizing that the translations were not to be read as poems in themselves. His readings were described as deeply moving even by listeners who did not speak Gaelic; according to Seamus Heaney, "MacLean's voice had a certain bardic weirdness that sounded both stricken and enraptured". Gaelic poet George Campbell Hay wrote in a review that MacLean "is gifted with what the Welsh call Hwyl, the power of elevated declamation, and his declamation is full of feeling." These readings helped establish his international reputation as a poet. MacLean's poetry was also translated into German, and he was invited to poetry readings in Germany and Austria.