My introduction to Grado-land was the SR80. These were broken after a few years, and I moved on to an MS1 by Alessandro run through a Little Dot MK III. Badly mixed or sourced music sounds bad, everything else sounds quite nice. I spent 25 years away from audiophile headphones, and must say that cans are a much more intimate listening environment in which it is easier to find and appreciate details.
For the spoken word, folk, world, acoustic jazz and classical that I listen to I think that an open back design is optimal. I was listening to "Moola Mantra" a month ago, and caught the percussionist _almost_ making a mistake, catching it and fixing it without more than a very slight pause. I know that wasn't audible with my speaker system or low-fidelity headphones. The sound stage of the Grado-verse matches my listening preferences, and I can hardly wait to hear how my Martin-built Turbulent X phones will further reveal my music.
Good starting points for Grados would include Steeleye Span, Niyaz, Dar Williams, Anne Hills, Maddy Pryor, Union Station, Joan Baez and Lucinda Williams. Most of Bach's works are a decided win for these cans as is spoken word or audio drama. .