Oh hands down, this is an easy answer. The Indigo Girls.
I vividly remember the first time I ever heard their dulcet tones crooning to me from MTV (back when it actually was MUSIC television). I was in the kitchen, face in the fridge when I heard this:
Darkness has a hunger that's insatiable
And lightness has a call that's hard to hear
I wrap my fear around me like a blanket
I sailed my ship of safety till I sank it, I'm crawling on your shore.
I was stunned into silence as I watched these boyish girls sing to my soul and crack it open in a way no song ever had before. I stopped what I was doing and drove straight to Wherehouse and bought the tape (yes, I'm old, this was long before CDs and shortly after vinyl). I drove around in my Yugo (yes, you can laugh) and listened to it till I knew the word to every song, crying over so many of them. How could these women who didn't know me KNOW me? Folk music has always spoken to me, as I grew up listening to Peter Paul and Mary, and Simon & Garfunkel. But this... this music was me.
I think I saw them live 10 times before I had a kid and ran out of time and money to see every concert I wanted to. I own all of their albums (are they still called that?) in one form or another, some on CD, some digital, some on tape. For every major moment of my life, one of their songs has spoken to me, supported me, held my hand through some tough ass days. I wish I could tell you about all of them, I wish I could tell you how some days I need to hear a certain song for fear my heart might wither.
Songs that helped me heal broken hearts, songs that made me want to kiss the one I loved with passion that was unending, songs that I'd sing from the top of my lungs while rocketing down the freeway on the road to the man who would become my husband, songs that got me through the dark days of infertility, songs that pulled me back from the brink of despair when I was unsure if I would ever be a mother, songs that then buoyed my soul when I was finally on the road to motherhood, but fearful of the unknown, songs that I sang through her long long long labor, when singing was the only way to survive the contractions, songs that have held me close during the hard days of mothering a child with autism, songs that were a balm to my broken heart after loss and subsequent failure to conceive a second (third) time, and now songs that I play for my music loving 4 year old and hope that she loves them too.
So, yeah, this was an easy one. My heart belongs to the Girls.