7z command works fine on command line but not in script

[berenger.morel@neutralite.org]

Hello.

I made a script to extract music from a jamendo archive, but for a 
reason I do not know, 7z does not accept the command line. I also echoed 
it, to be able to know what it tries to run, and it works fine when ran 
on command line.

Here is the script:

#!/bin/sh

for i in *.zip;
do
	artiste=`echo $i|cut -f1 -d-|sed -e 's/^ *//g' -e 's/ *$//g'`
	album=`echo $i|cut -f2 -d-|sed -e 's/^ *//g' -e 's/ *$//g'`
	mkdir "$artiste/$album" -p
	7z x \"$i\" -o\"$artiste/$album\" || rmdir "$artiste/$album" -p
	echo 7z x \"$i\" -o\"$artiste/$album\"
done

With, for example, this archive: 
http://www.jamendo.com/fr/list/a69778/monument, the folders are 
correctly created, but it prints:
Error: Incorrect command line
7z x "Shearer - Monument - a69778 --- Jamendo - MP3 VBR 192k.zip" 
-o"Shearer/Monument"

Do someone knows what I am doing wrong?