One possible way of dealing with the g string tuning issue (my experience has involved the low e more than anything) is to wind the string on the peg so that the winding goes up from the bottom of the peg, not v.v as it is done at factory. This reduces the angle at which the string sits relative to the nut and neck, potentially reducing the problem caused by the friction this angle creates when it contacts the nut. It will likely have a significant impact on the string staying in tune over time and you don't have to worry about filing the nut. A little nut lube might help too.
Invented in 1931, the amplified electric guitar was adopted by jazz guitar players, who wanted to play single-note guitar solos in large big band ensembles. Early proponents of the electric guitar on record include Les Paul, Lonnie Johnson, Sister Rosetta Tharpe, T-Bone Walker, and Charlie Christian. During the 1950s and 1960s, the electric guitar became the most important instrument in popular music. It has evolved into an instrument that is capable of a multitude of sounds and styles in genres ranging from pop and rock to country music, blues and jazz. It served as a major component in the development of electric blues, rock and roll, rock music, heavy metal music and many other genres of music.
An excerpt: “The Dobro brand name has been identified with resonator guitars since 1929 and is currently owned by Gibson Guitar Corporation. Despite its registered trademark status, the Dobro name has at times been used generically to refer to woodbodied instruments with 1) an aluminum cone or “resonator” mounted so that the cone opens toward the top of the instrument and 2) an 8-armed spider assembly supporting the bridge.”
The electric guitar was born out of necessity. Going back to the big band era, acoustic guitar players needed an instrument that could be heard over all the brass and woodwind instruments. They also need to be heard over the banjos and mandolins on the front porch. In the 1930s, companies such as Rickenbacker and Gibson started to add guitar pickups to their instruments, which allowed musicians to plug them into an amplifier for added volume. Rickenbacker added a pickup to their Hawaiian guitar (also known as a lap steel guitar) “Frying Pan” model, and similarly, Gibson added a pickup to their electric Hawaiian EH-150 model. Soon after that, Gibson introduced the iconic ES-150, which gave players the very best of both worlds. It gave guitarists a world-class Gibson hollow body guitar with a built-in pickup, which made it the perfect fit for guitarists who played large ensembles. In 1951, Fender revolutionized the electric guitar market even further by unveiling the first ever mass-produced solid body electric guitar, now known as the Telecaster, which was introduced in order to combat the feedback that hollow body electric guitars produced. Then in 1952, Gibson worked closely with one of the most widely respected guitarists of the era to create the first Gibson solid body electric guitar, now known as the Les Paul and named after its co-inventor.