Maybe I missed something here, but not sure why you want to resize '/' partition.
Thought you were just moving your music so you could reinstall.
Anyhoo, its not going to let you resize that partition at all if:
1. There is no free space on the upper side, so it can't be expanded.
2. The data on the partition takes up all the available blocks, so it can't be decreased.
In that case it will let you know that resizing is not an option-- by not letting you.
s.d.
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