Some context: A musical ensemble, also known as a music group or musical group, is a group of people who perform instrumental or vocal music, with the ensemble typically known by a distinct name. Some music ensembles consist solely of instruments, such as the jazz quartet or the orchestra. Some music ensembles consist solely of singers, such as choirs and doo wop groups. In both popular music and classical music, there are ensembles in which both instrumentalists and singers perform, such as the rock band or the Baroque chamber group for basso continuo (harpsichord and cello) and one or more singers.
The four-piece band is the most common configuration in rock and pop music.  Another common formation was a vocalist, electric guitarist, bass guitarist, and a drummer (e.g. The Who, The Monkees, Led Zeppelin, Queen, Ramones, Sex Pistols, Red Hot Chili Peppers, R.E.M., Blur, The Smiths, Echo and the Bunnymen, The Stone Roses, Creed, Black Sabbath, Van Halen, Rage Against the Machine, Gym Class Heroes, The Stooges, Joy Division, and U2.) Instrumentally, these bands can be considered as trios. This format is popular with new bands, as there are only two instruments that need tuning, the melody and chords formula prevalent with their material is easy to learn, four members are commonplace to work with, the roles are clearly defined and generally are: instrumental melody line, rhythm section which plays the chords or countermelody, and vocals on top.  In some early rock bands, keyboardists were used, performing on piano (e.g. The Seeds and The Doors) with a guitarist, singer, drummer and keyboardist. Some bands will have a guitarist, bassist, drummer, and keyboard player (for example, Talking Heads, Gerry and the Pacemakers, Small Faces, King Crimson, The Guess Who, Pink Floyd, Queen, Coldplay, The Killers and Blind Faith).  Some bands will have the bassist on lead vocals, such as Thin Lizzy, The Chameleons, Skillet, Pink Floyd, Motorhead, NOFX, +44, Slayer, The All-American Rejects or even the lead guitarist, such as Death, Dire Straits, Megadeth and Creedence Clearwater Revival. Some bands, such as The Beatles, have a lead guitarist, a rhythm guitarist and a bassist that all sing lead and backing vocals, that also play keyboards regularly, as well as a drummer.
can a bassist ever sing?
A: The Beatles, have a lead guitarist, a rhythm guitarist and a bassist that all sing lead and backing vocals,

Some context: Titu Liviu Maiorescu (Romanian: ['titu majo'resku]; 15 February 1840 - 18 June 1917) was a Romanian literary critic and politician, founder of the Junimea Society. As a literary critic, he was instrumental in the development of Romanian culture in the second half of the 19th century. A member of the Conservative Party, he was Foreign Minister between 1910 and 1914 and Prime Minister of Romania from 1912 to 1913. He represented Romania at the Peace Conference in Bucharest that ended the Second Balkan War.
In the summer of 1862 he was assigned as a substitute lawyer at the Law Court, then he became an attorney. He married his pupil, Clara Kremnitz. In November/December, he became a teacher at the University of Iasi and principal of the Central Gymnasium from the same town.  In 1863 he was assigned to teach a University course of history, on the subject ,,About the History of the Roman Republic from the Introduction of Plebeian Tribunes until the Death of Julius Caesar Especially Regarding the Economical and Political Progress". From February until September he was the Dean of the Philosophy Faculty of the University of Iasi. On 18 September 1863 he was elected as rector of the University of Iasi for a period of four years. In October he was assigned as principal of the School ,,Vasile Lupu" from Iasi. He taught Pedagogy, Romanian Grammar, Psychology and Composition there. For the first time in Romania, he initiated the Pedagogic Practice for pupils and one of these pupils was Ion Creanga.  In 1863 Titu Maiorescu published in Iasi the "Yearbook of the Gymnasium and the Boarding School from Iasi for the School Year 1862-1863"; the yearbook was preceded by his thesis: ,,Why Should the Latin Language be Studied in Gymnasium as Part of the Foundation of Moral Education?" On 28 March Titu Maiorescu's daughter, Livia, was born. She later married Dymsza; she died in 1946. On 8 October Titu Maiorescu is elected to lead the Institute Vasilian from Iasi, which needed to be ,,fundamentally reorganized". In order to complete this mission, commissioned by the Minister of Public Directions from back then, Alexandru Odobescu, he traveled on a documentary journey to Berlin and later he returned to Iasi on 4 January 1864.  Between 1863-1864 Titu Maiorescu taught Philosophy at the Philology University of Iasi.
what was his best accomplishment?
A:
On 18 September 1863 he was elected as rector of the University of Iasi for a period of four years.