If you use music, external files or brushes (.blc) in a letter
that you intend to send via email, then you must consider the
size of the files. If you don't use any external files, then
there is no need to worry - .bl is a very efficient graphics
format. But the moment you add a mod, the size increases (with
the size of the mod packed with lha). And most people don't
like to receive big 300K emails without confirmation. But there
is a solution! SIDs! This music format is really tiny! It is C64
music and can be played using Hippoplayer! And who wouldn't
like to hear some game music from their youth while reading a
letter?
Take a look at: www.hvsc.c64.org
Here you can download almost every piece of C64 game music
ever written!