to be fair, no one can stop music fellas from singing about political views, just like no police can stop crimes from happening.
if music fellas really think the politics in singaland really so free to clamp down on them, thats prolly self induced mind phucking sodomization on oneself creativity.
anyone and everyone can do anything, but will have to be responsible for their own action.
anyway, there used to be a local band in late 90s, early y2k era which i came across that did stuff similar to ratm instrumental arrangement called one man down. Not sure if they are still around. The bassist used to work at sweelee iirc