Historical keyboard instruments musician, João Janeiro divides his professional activity between research, concerts, recordings and teaching. He studied in Lisbon, where he completed his studies in harpsichord, organ, clavichord and historical musicology.
He founded and directed the Flores de Mvsica, Capella Joanina ensembles and Concerto Ibérico baroque orchestra, with which he has actively disseminated Portuguese musical heritage in concerts, CD recordings, conferences and masterclasses. He responsible for several modern premiere works of Portuguese baroque composers. He collaborated with national and foreign orchestras and recorded several CD's on historical organs and instruments dedicated to Portuguese music.
He has participated in several international music festivals in Portugal, Spain, Italy, Germany, France and Switzerland, as soloist or maestro al cembalo, having directed several productions of baroque opera in Portugal and Italy.
He directed the critical editions of works by João Baptista Avondano and Francisco António de Almeida and directed the CD recordings of Te Deum and the Missa in Fá de Almeida and Matuttino de 'Morti by David Perez for soloists, choir and orchestra, from which he is preparing the critical edition of the score. He has recorded two CDs with the Avondano Ensemble dedicated to the sonatas of João Baptista Avondano and the chamber music of Pedro António Avondano. He has been working on the critical editions of the first opera of a Portuguese composer - La Pazienza di Socrate by F. A. Almeida - and of other scores for soloists chorus and orchestra of this composer.
He has worked on the reconstruction of the Concerti Grossi of Pereira da Costa that were  published in London in the mid-eighteenth century and promoted the dissemination of the musical work of João Lourenço Rebelo in concerts, international stages in Italy and also with the recording of the CD 'Vésperas da Beata Virgin Mary'. He recently performed the modern premiere with historical instruments and recorded for CD the Requiem of João Domingos Bomtempo with the High Sponsorship of the Presidency of the Portuguese Republic.
In parallel, he has recorded the CD of the Bach’s St. John Passion with Concerto Ibérico; the Sonatas of Johann Ernst Galliard with Contagio Barroco ensemble and he is preparing the CD recording of Bach flute sonatas with young flute virtuose Filipa Oliveira. Next september another solo organ CD with historical organs will come out and also the second CD project of the Concerto Ibérico entirely dedicated to the musical relations between Naples and Lisbon.
He directs the 'West Coast Early Music Festival', 'SIMA-Sére Ibérica de Música Antiga’ festival where some of the best international musicians in early music milieu already played. In 2001 he finished the Inventory of Historic Organs of the Alentejo and coordinated several restoration processes for the Ministry of Culture. He is responsible for the International Summer Early Music Courses and Consort and Basso Continuo Stages in Portugal.
It teaches harpsichord, chamber music, basso continuo and the historical performance classes at Superior School of Arts ESART-IPCB and organ at EMNSC. He has been working on the dissemination of historical keyboard instruments and the historical performance for more than 20 years, in concerts, masterclasses, basso and baroque orchestra seminars in several counries of Europe. President of MAAC and founding member of CESEM (FCSH-UNL) and of the Portuguese Society for Research in Music (SPIM), he has presented papers and published articles on organology and Portuguese Baroque music.