Hi Michal
I listened to extracts of most of the songs in the playlist you posted. Firstly I would say from what I listened some of the songs are likely not to hard to play but others have some quite difficult technical aspects. One thing they all have is the guitarist(s) are playing with expression, control and accuracy, in other words a high level of playing.
To answer your question about whether BLIM would enable you to do that, in 6 months from grade 3 the honest answer is no. But the real answer is it will develop your playing and understanding of the blues, give you a practice ethic(if you follow Justin’s practice guidance) and road map to developing your playing and guitar skills to a higher level. The key to that IMHO and experience is dedication and daily practice.
I have rejoined BLIM4 after 3, as due to other issues was unable to keep up in the later months of the course, so am trying to consolidate and do what I missed, songs in particular.
The songs mentioned are a good examples IMO of what can be challenging in BLIM, ‘Sweet Home Chicago’ may sound uncomplicated and an easy to play example, but it depends how you approach it, if you simply do a blues shuffle in E damping the strings, and a simplified intro and outro the then not a big challenge, depending on your skills at the start, But if you try to do it justice and play the Robert Johnson original with all the variations and fills it’s a different ball game IMO, especially if you not only want to play it accurately but also with style.
‘Crossroads as presented by Justin in the Clapton form is another where it sounds straight forward but actually is quite difficult to play consistently accurately, due to its speed and various techniques needed, especially if you look at the original version. And if you tackle the solos an even bigger challenge.
I think it would be far for me to say the quite a few in BLIM3 found both challenging, from what the videos posted most achieved reasonable versions of one or the other, and a few were very good. I did ‘Crossroads’ in the time I had, it had mistakes, and timing was inaccurate in places, and I was not happy with my attempt. A case of a step too far at that point maybe, but I was determined to revisit it and improve.
BLIM will improve a guitarists IMO playing but it does require a reasonable amount of dedication and determination, the more you put into it the more you will get out. Go for it when you’re ready it is a lot of fun and will help you improve.