When describing the
song you might have to focus on specific parts. Don't say that a song has a "high
pitch", when you really mean the singers voice has a high pitch.
Also, some things are not really noteworthy unless they are really unusual. For instance, the duration of notes, while important is only worth mentioning when you are talking about singers who hold notes for really long times.
For each aspect you wish to discuss, first consider if it applies to the whole song, like tempo, or only to a particular section or instrument. For instance, if a song has a particularly interesting sound in it, you might discuss its timbre. Some things can apply to individual musicians or the entire group. For instance, some bands use dynamics such that everyone is playing softly or loudly. Others feature one player playing forcefully while other players lay back.
Ultimately, your success in this task will be determined by how well you are able to apply the terms. If it seems like you know what you are talking about then you probably do.
