Final answer:
Wagner's critique in 'Das Judentum in der Musik' was based on anti-Semitic sentiments, accusing Meyerbeer of superficiality and Mendelssohn of lacking depth, claiming Jewish composers could not truly contribute to German music.
Step-by-step explanation:
Richard Wagner's criticisms of other composers like Giacomo Meyerbeer and Felix Mendelssohn in his controversial essay Das Judentum in der Musik (Judaism in Music) were based on anti-Semitic views. Wagner accused both composers, who were of Jewish origin, of lacking genuine creativity and the ability to express true German spirit in their music. He claimed that Meyerbeer's works were superficial and aimed primarily at public success rather than artistic value, whereas Mendelssohn's music, although technically skilled, lacked depth and emotional power. Wagner's critique was part of a broader argument that Jewish musicians were inherently incapable of contributing to the German musical tradition, an idea that was consistent with the anti-Semitic sentiments of the time.