which are the modern versions of this type?
Hammond organ a type of electronic organ.
Organ (music)
Hammond organ 
who was olivier messiaen? He was a French composer, organist, and ornithologist what instrument does the second type of person play? Organ what type of instrument is that? It is a keyboard instrument of one or more pipe divisions
wiki:1194718
Organ (music) [SEP] Electronic organs
Since the 1930s, pipeless electric instruments have been available to produce similar sounds and perform similar roles to pipe organs. Many of these have been bought both by houses of worship and other potential pipe organ customers, and also by many musicians both professional and amateur for whom a pipe organ would not be a possibility. Far smaller and cheaper to buy than a corresponding pipe instrument, and in many cases portable, they have taken organ music into private homes and into dance bands and other new environments, and have almost completely replaced the reed organ. The Hammond organ was the first successful electric organ, released in the 1930s.