Final answer:
In the songs "Roundabout" and "Strawberry Fields Forever," the instruments that are similar in both songs are the a. Mellotron and sitar.
Step-by-step explanation:
In the songs "Roundabout" and "Strawberry Fields Forever," both songs feature instruments that create unique sounds. In "Roundabout," the instruments that are similar to those used in "Strawberry Fields Forever" are the a. Mellotron and sitar.
The Mellotron is a keyboard instrument that uses tape loops to produce various sounds, while the sitar is a stringed instrument with a distinctive twangy sound. These instruments contribute to the psychedelic and experimental nature of both songs.