-core
combining form in countable noun
indicating a type of popular music
⇒ 
dancecore
combining form in adjective
indicating the number of processing units working in parallel in a computer
⇒ 
dual-core
-core
1 
a combining form extracted from hard-core and used especially to form words that name a rebellious, antimainstream lifestyle, social movement, type of music, etc.: emocore; queercore.
-core
                combining form
     -          (used as the second element of various compounds) denoting types of rock or dance music that have an aggressive presentation[复合词中的第二部分] 表示“…类别的疯狂摇滚乐(或舞曲)”:
-       queercore. 
词源
from CORE , on the pattern of hard-core.
ORIGIN: from -core in hardcore s.v. hard  adjective, adverb, & noun 
-core
Suffix
- Applied to various (often specialised and underground) genres of music.
Etymology
Back-formation from hardcore.
Derived terms
 English words suffixed with -core