Marcus, maybe you could explain why it matters to you whether ONE IRISH GUY, namely the lead singer of Na Casaidigh, pronounces the Irish Gaelic word ar with a "hard Russian r" or a "soft Russian r", and whether he pronounces the first letter in baeg as a "hard Russian b" or a "soft Russian b".
I mean, if you're studying Irish Gaelic and want to improve your own accent, then you need to record yourself saying the words ar and baeg, put the recording on YouTube, and ask for feedback from Irish Gaelic speakers.
Or, if you want to know whether the lead singer of Na Casaidigh sings with "proper Gaelic pronunciation", or if he has an English accent that's difficult to understand -- again, the people who can best answer this question are speakers of Irish Gaelic, not Russians!