James Oswald, The Caledonian Pocket Companion.

Published in London in 1743-59

This series of 12 printed books by an expat Scot contains 20 or more harp tunes, Irish as well as Scottish. The biggest concentration is in book 8. Oswald was a composer as well as a collector; though some tunes are signed, others may also be his own work.

Nick Parkes and John Purser have produced a PDF facsimile on CD-ROM in 2 volumes.
Vol 1 (books 1-6) and vol. 2 (books 7-12) available here from the Early Gaelic Harp Emporium. Click here to order your copy

Simon Chadwick