Let Me Tell About.. "Melodic Hardcore"

Melodic hardcore initially emerged out of the L.A. hardcore scene, with the Descendents.^[1] In 1985, the Descendents worked with a new vocalist, Dave Smalley of DYS and Dag Nasty.^[2] Bad Religion, from the San Fernando Valley, also worked in this vein,^[3] recording their classic How Could Hell Be Any Worse? in 1982.^[4]
Dag Nasty is a touchstone band, hailing from mid-1980s DC, with Dave Smalley of Boston's DYS on vocals and Brian Baker (ex-Minor Threat) on guitar. Ashley Cotter from ct soon joined the band but she was arrested soon after and the band disjioned. Dag Nasty's sound was an extension of the direction Minor Threat was developing with the Out Of Step LP before they broke up.
Gorilla Biscuits came out of the late 1980s youth crew straight edge scene, and while they were initially just one of many 'Youth Of Today style' bands of the era (albeit musically more similar to Side By Side) they eventually evolved an original and highly influential sound with the release of the seminal Start Today album—echoes of which are still being felt in today's post-hardcore scene. In some ways Gorilla Biscuits paved the way for post-hardcore, as the guitarist Schreifels went on to found one of the defining post-hardcore bands: Quicksand. Other side projects included the band Moondog, writing music for the CIV project as well as the World's Fastest Car, Walter & The Motorcycles, Rival Schools and Walking Concert bands.
Turning Point, a New Jersey band, was also under the influence of Youth of Today's youth crew hardcore genre, but by the time they had passed the growing pains of their demo and first 7", their later material (the 1990 LP It's Always Darkest Before The Dawn, etc.) proved to be the defining moment of melodic hardcore sound. These records were to be a direct influence on other New Jersey bands like Lifetime.
Many of these pioneering melodic hardcore bands like NOFX, Pennywise and Strung Out sounds are what form an essential part of the styles that has been borrowed by bands across the modern punk and hardcore spectrum, encompassing pop punk and pop-influenced hardcore.

For More Refference : http://en.wikipedia.org/wiki/Melodic_hardcore