This paper proposes a text-to-lyrics generation method, aiming to provide lyric writing support by suggesting the generated lyrics to users who struggle to find the right words to convey their message. Previous studies on lyrics generation have focused on generating lyrics based on semantic constraints such as specific keywords, lyric style, and topics. However, these methods had limitations because users could not freely input their intentions as text. Even if such intentions can be given as input text, the lyrics generated from the input tend to contain similar wording, making it difficult to inspire the user. Our method is therefore developed to generate lyrics that (1) convey a message similar to the input text and (2) contain wording different from the input text. A straightforward approach of training a text-to-lyrics encoder-decoder is not feasible since there is no text-lyric paired data for this purpose. To overcome this issue, we divide the text-to-lyrics generation process into a two-step pipeline, eliminating the need for text-lyric paired data. (a) First, we use an existing text-to-image generation technique as a text analyzer to obtain an image that captures the meaning of the input text, ignoring the wording. (b) Next, we use our proposed image-to-lyrics encoder-decoder (I2L) to generate lyrics from the obtained image while preserving its meaning. The training of this I2L model only requires pairs of "lyrics" and "images generated from lyrics", which are readily prepared. In addition, we propose for the first time a lyrics generation method that reduces the risk of plagiarism by prohibiting the generation of uncommon phrases in the training data. Experimental results show that the proposed method can generate lyrics with different phrasing while conveying a message similar to the input text.

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