Bass solos are performed using a range of different techniques, such as plucking or fingerpicking. In the 1960s, The Who's bassist, John Entwistle, performed a bass break on the song "My Generation" using a plectrum. He originally intended to use his fingers, but could not put his plectrum down quickly enough. This is considered as one of the first bass solos in rock music, and also one of the most recognizable. Led Zeppelin's "Good Times Bad Times", the first song on their first album, contains two brief bass solos, occurring after the song's first and third choruses. Queen's bassist, John Deacon, occasionally played bass solos, such as on the song "Liar". Metallica's 1983 debut Kill Em All includes the song "(Anesthesia) Pulling Teeth," consisting entirely of a bass solo played by Cliff Burton.
Tapewound (double bass type) and flatwound strings are sometimes used with the fretless bass so the metal string windings do not wear down the fingerboard. Tapewound and flatwound strings have a distinctive tone and sound. Some fretless basses have epoxy-coated fingerboards, or fingerboards made of an epoxy composite like micarta, to increase the fingerboard's durability, enhance sustain, and give a brighter tone.
Yet another form is the portable digital piano which is what appear to be combining the capabilities of stage pianos, but with additional features similar to a conventional digital keyboard. These digital pianos are mostly designed for various purposes such as home, studio, classroom, stage or personal use. It is similar in form to a stage piano, but much lighter in weight, and having a more compact size. Unlike stage pianos, portable digital pianos were commonly equipped with built-in amplification and loudspeakers, usually has lower cost than other types, and its sound quality were often comparable or similar to that of a regular digital keyboards due to a simpler sound synthesis system, though some models, still utilize a similar sound engine as the more advanced model lineups of the same manufacturer.