Using "Sequence" in music context

As a part of my academic paper, I wish to use the "Sequence" word.

Here is the problem:

1. As you can see in the picture, the "Start Time" of each note is mentioned on the time axis. I want to measure the time differences between A,B,C, and D but I do not know which terms fit in this context.

• The sequences of notes’ start time
• The sequences of starting time of notes
• The sequences of music scores

2. In another part, I trace the time differences when users press the piano keys. Again the same problem

• The sequences of key-pressed events

I would be grateful if you guys could help me to find a suitable term for this context.