extended, lengthy, long
brief, short
brilliant, great
opening
the opening piano solo

guitar, piano, violin, etc.
soprano, tenor, etc.

do, perform
dance, play, sing
feature, include
The song features an extended guitar solo.

Solo is used with these nouns:
act, album, artist, career, exhibit, exhibition, flight, instrument, passage, performance, performer, project, recital, record, show, singer, singing, track, venture, violin, voyage, work