You just drop the low E 6th string one whole step from E to D. For me having 11s instead of 10s on my guitar helps me with slide the extra tension andfeel feedback I get through the slide is important.
Mel Bay S Slide Guitar Wall Chart Slide Guitar Guitar Guitar Tuning
Drop D is a popular tuning for slide guitar thats easy to tune.

Tuning guitar for slide. Open E Open D Open C Open G and Open A are all demonstrated. Take a class in guitar finger picking. Open G tuning was one of the first slide guitar tunings to be adopted by Delta slide players in the early 20th century.
For this reason open G is sometimes referred to as a slack tuning. This is usually because theres an unpleasant learning curve when trying to play slide for the first time. It was a mainstay of Duane Allmans playing and is now Derek Trucks main slide tuning.
I wanted a short scale so that I can play both slide and regular more easily. So because of the larger strings and tension. Ive decided that I want to play slide in standard tuning.
However many players have no problems at all dealing with the radius. Compared with standard tuning 3 of the strings are tuned down in pitch in open G. Like the open D tuning open C tuning has other tuning options.
Tuning up gives you open E or open A down gives open D or G. While it presents certain challenges for slide guitarists Standard Tuning is actually a very versatile tuning for slide playing offering many convenient chord fragments both major and minor up and down the fretboard. Open D is an extremely popular open tuning for slide guitar.
The most common open tunings for slide guitar playing are open E D G and A. MORE GUITAR LESSONS. Being used by some of those old blues cats such as Elmore James Tampa Red Kokomo Arnold even modern day artist such as Bob Dylan and Joni Mitchell made use of this tuning.
Allman and Trucks widely considered to be two of the greatest slide players ever have mostly preferred to play slide in open E tuning which is spelled low to high E B E G B E. Open C tuning or variations on this open C tuning have been used by William Ackerman and Led Zeppeplins Jimmy Page. Open tunings have been exploited for use with slide guitar since the earliest days of Delta blues.
Open E slide guitar tuning is second only to open G in popularity because of its frenetic tone and ease of playing on the low frets. As you note great slide can come from any type of guitar. Slide guitar is something many players have a desire to learn but can be reticent to dive into.
Lee explains some great Open Tunings for which are perfect for slide and other applications. Because a slide generally has a straight edge some argue that setting your strings so theyre in a straight line is best for slide playing. Todd Rundgrens guitarist Jesse Gress has written extensively about Allmans playing.
This tuning is also know as Vestapol tuning. The above video is a good example of a slide guitarist making a great sound come from a standard acoustic guitar not a resonator guitar. If you play mostly in standard tuning and but want to occasionally play a slide guitar piece in open tuning do you tune up or tune down.
Generally if you are playing slide on an acoustic guitar you will tune down. The reason is that tuning up increases the tension on your guitar and that could end up damaging your top in. The most commonly used open tunings for slide are E D G and A.
Learning slide guitar in standard tuning allows you to focus on fret-hand touch and pick-hand articulation without having to re-learn the fretboard and chord forms in an alternate tuning. There are of course others that are utilized with many distinctive variations depending on the musician and style of music. Certainly this is a reasonable argument.
BridgeSaddle radius considerations when setting up for slide guitar.
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