it's absolutely about that Song of Mastery true it's NOT: "as song of mastery" except for duration like nearly all the "true" spells on that list and like nearly all rolemaster spells; it is "as calm song true" except target must obey the caster.
then as u know everybody can use his own houserules but me and my group will use this spell admitting complete alienation infact u should think that a 25th level spell can't have the same effect of an 8th level spell (i.e. master of kind, spirit mastery, closed essence) with even a restriction addicted compared with that because controlling songs spells force the bard in performing to have the spell last while for other spells (again i.e. master of kind, you cast it and then you can perform other actions having a duration of 10min/lvl).
About other spells that can alieant target give a look to magus base lists, or way of voice of astrologers and many other else.
P.S. our group discussed about it for so long after making this decision not easy to take but even in REALITY there are cases of music stars who can manipulate their fans in committing alien acts so why not in a game?
P.P.S. even if new on this forum it's 15 years that we play rolemaster
The spell description for the level 25 spell says "As Calm Song True". CST states that it works just like Calm Song except for the duration difference.
IMHO, this means the level 25 spell does not allow mutilation or suicide suggestions.
However, please see the 50th level spell on the Evil Mentalist Mind Subversion list. This is the only spell I know of that will allow you to suggest someone should commit suicide. (An evil GM can also have fun with the evil cleric "Friendslayer's Curse" spell)