 Hardcore guitarists sometimes play solos, octave leads and grooves, as well as tapping into the various feedback and harmonic noises available to them.There are generally fewer guitar solos in hardcore than in mainstream rock, because solos were viewed as representing the "excess and superficiality" of mainstream commercial rock.Hardcore bassists use varied rhythms in their basslines, ranging from longer held notes (whole notes and half notes) to quarter notes, to rapid eighth note or sixteenth note runs.