I don't think there are numeric qualifications with regards to reading or listening or watching something that is not biblically based.
If there were, wouldn't we be 'earning' points or something?
I prefer instrumental music ... lots on youtube which I listen to when working...I have a good number of Christian CD's and 'secular' instrumental ones... I happen to really like
Spanish guitar, latin and Mediterranean music and what have you...I'm pretty varied...I don't listen to rock anymore...I find it makes me nervous and the words are not
beneficial...but I don't think God judges anyone by my own preferences
I find that instrumental music keeps me in mind of God anyway....