I always hate these questions (is X worth it?) because you’re asking the Internet to give you an answer to a subjective question. If you want to sort out the answer for yourself it comes down to how much money you can afford to spend on entertainment and whether you think £1 of that amount for a song is worth it.
If you’re rich and £1 doesn’t matter in slightest and you like the song then it’s “worth it.” If you’re poor and you have £20/wk to spend entertaining yourself then maybe not. Anyway who knows, if you think the song is worth the price then go for it.
Also, just to throw this out there, there are an awful lot of ways to listen to music on the Internet that won’t cost you anything. You could always use one of those then later go back and buy music that’s particularly meaningful to you. Remember that streaming music pays the actual artists almost nothing, go buy physical media (or better yet go to one of their shows and buy merch) if you want your favorite artists to actually see any money.