Welcome to Celtic Radio Pendragon83. I hope you will enjoy the music as well as the wonderful people you will find here on the forums. I am glad you like Gaelic music, I do as well. Some bands that came to my mind when I read your post were, Runrig, Capercaillie. I know there's more just can't think of them at the moment. lol. There's a lot of helpful folks here I am sure they will be glad to help you out. I hope this helps some. I look forward to you posting here on the forums.
A few suggestions, The Rankin Family from Cape Breton. A group that's tougher to find but wonderful Tannas from Scotland, and if it's Irish you're after try to get a copy of Muireann Nic Amhlaoibh's cd Daybreak, on the Compass label. Agree too anything by Capercaille is magical. Cheers!
I can surely add Wolfstone, Ashley MacIsaak, Milladoiro and Dan Ar Braz...but they are only a few in the sea of great celtic Musicians. My preferred are Capercaillie, the singer Karen Matheson (that also has a solo career) is fantastic !