First, (If you can handle it)
Step One
Download The music, Be sure to save your music to the desktop.(C:/Users/%Current User%/Desktop)
Step Two
Once Saved to desktop, Go into the file That you saved there,(C:/Users/%Current User%/Desktop/%Song Pack%)
Open It, Drag a box around the songs you wish to keep, And Press "copy"
Step Three
Now Go into "C:/Blockland/Add-Ons/Music" or "C:/Program Files/Blockland/Add-Ons/Music"
Step Four
Right Click the folder, And Click "Paste" (If you did it right, It should be copying the music to that file, If not, go over this again and try to understand it)
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Welcome Note: Your welcome, Hope to see you in blockland sometime.