How can one define the jazz style hard bop? In which way is it different from bebop? Which are the main characteristics of the style?
1 Answers
A Return to a more energetic way of playing. Playing "hot", but with more control than in the Bebop which is more accessible to a wider audience.
Bebop's purely harmonic and technical characteristics vanish and make room for a more melodic, smooth style of playing.
The themes are less complicated and more melodic.
A clear influence of Afro-American "roots": gospel and blues.
The drummer's playing is very present, rhythm and polyrhythm gain importance as a result of the African influences.
The use of suspend chords and pedal notes: gospel influence.
The line up is usually a rhythm section and two or three horns.
Comparison: bebop, cool jaz, hard bop.

According to this article, there were two factions of hard bop:
1: Funky jazz was relatively simple (simple melodies, simple chord progressions, simple forms); its essence was one of groove and feeling and was heavily influenced by blues and gospel music.
2: Mainstream jazz was far more complex (more difficult melodies, improvisations, chord progressions, and forms); it was still about groove and feeling but added the complexities of bebop; a bit of arranging was often included as well (worked out introductions, endings, harmonized heads, background lines, etc.).
Examples:
Horace Silver’s “Nica’s Dream” (mainstream)
John Coltrane’s “Giant Steps” (mainstream)
Art Blakey’s “Moanin’” (funky jazz)
Miles Davis’ “Walkin'” (funky jazz)
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4... Bebop which is more accessible to a wider audience. How can you proof your statement? – Sep 25 '15 at 06:34
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2Mainly black musicians? Really? That's not even comparative across the three tabled genres. – Mar 14 '16 at 14:25