Seven Black Roses is quite an astonishing number, especially when you consider the technical difficulty in playing the song and singing it at the same time. A lot of coordination that's required there for sure.
I've been moving slowly into singing along my playing in the past 5 years and I still make the odd horrendous mistake, but I reckon that's all part and parcel of the game anyway

I've seen a lot of crazy technical ability in my day, but we must not forget that technical ability is one thing, keeping the masses interested is quite another. It's easy to be so good that you send every attendant to your gig into nod country, if the quality of the songs is much poorer than the musical wank you're capable of producing through your technique.