You can upload audio files on Mastodon. The upload works just like attaching images or videos, but you select a sound file instead. You can also attach artwork by clicking Edit and then Choose Image.
There is no time limit on audio, but it has to be within the file size limit on your server (usually 40MB).
Supported formats are MP3, OGG, WAV, FLAC, OPUS (rename it to end in .ogg), AAC, M4A or 3GP.
(Music is "Modern Technology" by Mokka Music, used under CC-By licence)
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.