[x] band name question

I've entered an album in the queue by "Arjen Lucassen's Guilt Machine". However, the spine of the album just says "Guilt Machine" (as the band name). So how should we enter this?

Apart from the above issue, on closer inspection, the cover says "Arjen Lucassens Guilt Machine"; whithout the apostrophe. However, the 's' is in much smaller print than "Arjen Lucassen" so one could argue that this is a stylistic equivalent of "Arjen Lucassen's".