I grew up on Christian music only (especially southern gospel and whatever was "contemporary" at the time), and only started discovering the rest of the musical world when I hit high school.
My wife and I are musicians, so really nothing which involves people actually singing and/or playing instruments is out of bounds.
She was raised on the classics of '70s rock, so my discovery of those classics as an adult based solely on their artistic merits (rather than the nostalgia which keeps my elders rocking past age seventy) has been a wondrous experience.
Especially when my wife and I were able to see the tribute to Led Zeppelin live, and Queen + Adam Lambert this past summer.
I discovered jazz (in jazz band, no less) just before high school, and have been an avid enthusiast ever sense.
Of course, the creme de la creme for both of us lies in the vast potential filed under "a cappella". Virtuosos of this form leave a visceral impression upon us, literally left breathless as we experience the overlapping and clustered harmonies, the variety of genres which can be adapted into voice-only form, the RANGE of the vocalists involved...the hits just keep coming.
Let me be crystal clear on the following point:
MUSIC IS NOT EVIL.
Never. Ever. Regardless of whether you think the lyrics are "appropriate" or not.
The act of creating music is one of the few remaining ways we human beings extend our innermost being out into the world in order to connect with one another.
The act of performing music latches the musician's soul onto that of the composer (assuming they are not in fact the same person), and creates a depth of connection seen nowhere else.
The act of listening to and experiencing music latches the listener's soul onto both that of the musician and that of the composer, and allows potentially thousands of people to join in a communion which leaves us in tune with each other as soul-possessing beings, in ways that no other experience in the human condition can equal.
You do not have moral high ground just because you do not prefer to listen to a particular style of music or enjoy the lyrics of a particular song.
And just to counter this beforehand, NO, the lifestyle of the composer or musician does NOT inflict a particular morality upon his/her music.
Music is music. It stands on its own.