Wave files are quite large, midi files are very much smaller.
I suspect that the one you received was in midi form. Have a listen to a midi file here; it is only 52Kb. A similar piece of music in wave form would be many hundreds of Kbs.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.