When memorizing music, I typically use existing patterns. These are often a scale (sequence of notes) or a chord sequence (sequence of finger positions, giving 3 or 4 notes at a time). It's probably a good idea to use these patterns, because music theory requires that they appear.
However, I have trouble memorizing the Carcassi Op. 60 no. 7 study (tab, sheet). I can mostly memorize everything except bars 13-15 and 25-27 (or 24-26, if you look at the tab). The problematic bars contain a sequence of 2 notes at a time, which don't seem to be parts of either a chord or a scale. I suspect that music theory has something to say about why these notes are there, and I can use it to memorize them.
Here are bars 13-15 for reference:
E|-------------------------------|------------------0-0-0--------| B|----------2-2-2---3-3-3--------|--0-0-0---4-4-4-----------3-3-3| G|--2-2-2-------------------5-5-5|------------------------1------| D|3-------2-------0-------4------|5-------3-------2--------------| A|-------------------------------|-------------------------------| E|-------------------------------|-------------------------------| E|------------------------------- B|--1-1-1---1-1-1---0-0-0-------- G|2-------------------------2-2-2 D|----------------0-------1------ A|--------0---------------------- E|-------------------------------
So, how can I make reason of notes that appear in pairs? Or, if there is no way to do so, how can I memorize such a sequence effectively?