The Sacred Harp has 431 images...each between 70-120 megs

see here

It should be possible to download it efficiently with one of the special download manager programs........I have used a program called "Go!zilla" for projects, but there are others. (The usual trick is to run 3-4 files at a time,,,or break up a file into parts and re-assemble it.)

here is one of the best DLEXPERT 0.99 (748 KB)

NOTE: as of version 0.95, program is once again Freeware. DLExpert is a multi-thread resuming downloading software. It makes full use of resources of the client and the server to download files from the Internet at the most speedy rate. DLExpert can divide the file into any parts, at most more than 100 parts (NOT ONLY 5 OR 6 PARTS). Each of them will be downloaded by one thread, so different parts can be downloaded simultaneously, resulting in speedy downloading. DLExpert supports HTTP and FTP, also HTTP and FTP proxy. Its function of auto-dial, auto-hangup, schedule downloading and auto-shutdown make it convenient.