My band's trying to upload a song to ReverbNation. It's roughly 4 minutes, instrumental, and only has 3 tracks. However, when we converted it to MP3 it was 35 MB. Reverbnation only allows us to upload up to 8 MB (up to 25 for mega storage) and we need to know how to compress it, yet still upload in MP3. It suggested we upload in a lower quality. The song was recorded in Garageband on 3 tracks, uploaded to iTunes, and converted to MP3.