Your music needs to fit the targeted genre and match the audience expectation.
To that aim, the loudness and the dynamics should be adjusted properly. This done in the mastering phase. Mastering is not only about making a song loud. The compression of the transients and other dynamics elements are also important. I use iZotope tools in conjunction with a great loudness meter.
Mastering is also the stage where I embed the metadata you need in the audio file.
I can certainly embed the metadata you need in the master.
To that aim, the loudness and the dynamics should be adjusted properly. This done in the mastering phase. Mastering is not only about making a song loud. The compression of the transients and other dynamics elements are also important. I use iZotope tools in conjunction with a great loudness meter.
Mastering is also the stage where I embed the metadata you need in the audio file.
I can certainly embed the metadata you need in the master.