Maclean was the first person to undertake the systematic collection of the old Gaelic songs, stories and traditions in the Highlands and Islands with modern recording apparatus. Therein lies the importance of his work. A good deal had been done previously in the way of collecting old stories in the Highlands by
John Francis Campbell of
Islay (1821–1885) and his collectors, but lacking any means of making mechanical recordings, their task of writing down such tales from dictation was a very laborious one, and J. F. Campbell himself admitted that his collection in no way exhausted the stories current in the Highlands "whole districts are yet untried, and whole classes of stories, such as popular history and robber stories, have yet been untouched." Most importantly, Maclean spent a little over a year (from Summer 1951 to Autumn 1952) undertaking professional training at
Uppsala University in
Sweden which was then, as now, at the forefront of folklore methodology, cataloguing and archival techniques. Maclean benefited greatly by what he learnt at this institution as well as his time at the
Irish Folklore Commission. Having studied under Professor
Dag Strömbäck, he later set up an index system for
Scottish folklore at the School of Scottish Studies based on the Uppsala one. Maclean's fieldwork experience, in-depth knowledge of Gaelic oral tradition and broad academic knowledge provided him with a unique combination of skills that were advantageous to collecting. In addition, Maclean had a remarkable facility to put people at ease and so gained their confidence. He stressed this observation in one of his articles that "for any folklore collector the crucial time is when contact is first made with the tradition bearer" and that "every folklore collector must be prepared to efface himself and approach even the most humble tradition bearer with the deference due to the high and exalted." Due to abiding by this principle, Maclean was able to find contacts and tradition bearers and by doing so he managed to gather in a vast amount of oral material straight from people's memories. Out of the hundreds of people recorded by Maclean, there were four storytellers that struck him as exceptionally talented: Seumas MacKinnon, known as Seumas Iain Ghunnairigh, (c. 1866-c.1957), from Northbay in
Barra, Duncan MacDonald, Donnchadh Mac Dhòmhnaill 'ic Dhonnchaidh, (1882–1954), from Peninerine in
South Uist, Angus (Barrach) MacMillan (1874–1954), from Griminish in
Benbecula and John (The Bard) MacDonald (1876–1964) from Highbridge in Brae
Lochaber. ==Legacy==